Number of electrons in a Ca²⁺ = 18
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20
Electron configuration of Ca : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²
When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:
[tex]\tt 20-2 = 18[/tex]
and the electron configuration (Ca²⁺ ) becomes:
1s², 2s², 2p⁶, 3s², 3p⁶
HELP ASAP EILL MAKE BRAINLEST Students are conducting a la estimating the time takes for the cell cycle in normal chocols They find that the average time for one complete el cycle is 22 hours What arence would they expect to see nerous chien
Cancerous chicken cels will spend more time in the phase
Cancerous cells will not complete all phases of the cell cyce
Cancerus chin cells will complete moss in a shorter amount of time
O Cancerous chicken cols and normales will have the same total amount of time to complete the cell cycle
Answer: I don't know if this helps but here's some information I think might help.
Usually, cells will take between 5 and 6 hours to complete S phase. G2 is shorter, lasting only 3 to 4 hours in most cells. In sum, then, interphase generally takes between 18 and 20 hours. Mitosis, during which the cell makes preparations for and completes cell division only takes about 2 hours. Calculate the percentage of time spent in each phase by counting the total number of cells in each phase (total in interphase, in prophase, etc.) and dividing each by the total number of cells you counted. How do cancer cells differ in total time required for mitosis? Cancer cells produce 117 minutes faster than regular cells. ... Normal cells require 640 minutes during interphase, cancer cells only need 380. For prophase, cancerous cells need 15 minutes less than regular cells. Another hallmark of cancer cells is their "replicative immortality," a fancy term for the fact that they can divide many more times than a normal cell of the body. In general, human cells can go through only about 40-60 rounds of division before they lose the capacity to divide, "grow old," and eventually die 3.
identify this compound: KClO4
Answer: Potassium perchlorate
Explanation:
True Or False? A magnet slows down because it created an opposing electric force as it fell.
Answer:
faules
Explanation:
truck it
Which one of the following is an example of a difficulty caused by thermal
expansion?
O A. The siding on a house buckles on a hot day.
OB. Watery iced tea
OC. Smog in the air during summer heat
OD. lce cream not getting hard
Answer: A
Explanation:just passed it
Answer:
A. The siding on a house buckles on a hot day
Explanation:
The key word in this question is EXPANSION. Without even knowing the siding expands causing it to buckle when it's hot, you can use process of elimination. It can't be answer B because watered down iced tea would most likely be as a result of the ice melting which is the opposite of expanding. It can't be C because air is not solidified and therefore can't expand. Lastly, D cannot be it because ice cream expands when cold, causing it to become hard. If it's not hardening then it's not expanding. This is also the correct answer on a p e.x
The infections that people get while they are in hospitals are commonly resistant to multiple drugs. What is a reason for the increased number of drug-resistant bacteria being found in hospitals?
A.
increased use of antibiotics in hospitals
B.
increased number of diseases in patients
C.
decreased sanitation facilities in hospitals
D.
decreased microbial growth in hospitals
Explanation:
d
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Answer:
D
Explanation:
I have this test as well
Match the following family of elements to its group.
Explanation:
To solve this problem, we simply use the periodic table of elements which groups elements based on their atomic numbers.
The atomic number of an element is the number of protons it contains. The protons are the positively charged particles within an atom.
The vertical arrangement of elements on the periodic table is the group. The horizontal arrangement of elements is the period.Now;
Noble gases belongs to group 18
Alkali earth metals belongs to group 2
Halogens belongs to group 17
Alkali metals belongs to group 1
Transition metals belongs to group 3-12
What will cause an object to move?
please;( urgent CuSO4•5H2O is blue
Which part of an atom is used to form bonds with other atoms?
Answer:
valence electrons
Explanation:
valence electrons
Which of the following is an example of a decomposition reaction?
Balance the following equation:
_ H202 --> _H20+_02
When the equation is balanced, what would be the coefficient in front of H20
Type your answer...
Given :
A chemical equation :
H₂O₂ → H₂O + O₂
Solution :
We can see that there are 2 oxygen atoms in LHS and 3 on RHS .
So, we can reduce the oxygen atoms to two in THS by just dividing it by 2.
H₂O₂ → H₂O + [tex]\dfrac{1}{2}[/tex]O₂
Now, multiplying both sides by 2, we get :
2H₂O₂ → 2H₂O + O₂
Therefore, the balanced chemical equation is 2H₂O₂ → 2H₂O + O₂ .
which of the following statements describes how the ionic bond is formed
a.) nonmetals share electrons with other metals.
b.) metals take electrons from nonmetals.
c.) metals allows their electrons to freely move around other metals.
d.) nonmetals take electrons from metals.
The statement that best describes how the ionic bond is formed is as follows:
Non-metals take electrons from metals.Thus, the correct option for this question is D.
What are Ionic bonds?Ionic bonds may be defined as the type of chemical bond that significantly involves the electrostatic force of attraction between ions of opposite charges, or between two atoms with different electronegativities.
When ionic bonds are formed between atoms or ions, the metal loses electrons and acquires a positive charge over them. They are known as cations. While the non-metals accept those electrons and acquire a negative charge on them. They are known as anions.
Therefore, non-metals taking electrons from metals is one of the statements that best describes the formation of ionic bonds. Thus, the correct option for this question is D.
To learn more about Ionic bonds, refer to the link:
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12. Which noble gas is expected to show the largest deviations from the ideal gas
behavior?
A) helium
B) neon
C) argon
D) krypton
E) xenon
Is this equation balanced as is?
Ca(OH),
Cao
+
H,0
yes
no
Answer:
i think its yes
Explanation:
Answer: the answer is yes
Explanation: I know because I had it on my chemistry test yesterday
Is this statement true or false?
Inner planets have many natural satellites.
true false
Answer:
true
Explanation:
we have many sattelites that are seen by many astounouts in space by telescope but more than half space is not discoverd
Which of the following is an example of a physical change in digestion?
water being absorbed in the large intestines
enzymes break down food nutrients
nutrients are broken down into different molecules
saliva breaking down carbohydrates
Answer:
The answer would be C
Explanation:
I got it right on E D G E N U I T Y
2021
Please Help! I Really Really Need It!
Answer:
The picteure isnt lodeing
Explanation:
mark brainly
HELPPPPPP MEEEE‼️‼️‼️Use the equations from
Deoxyribonucleic acid is also referred to as
The answer is nucleic acid
Answer:
(DNA) is a molecule that encodes an organism's genetic blueprint
Explanation:
Deoxyribo Is the D
nucleic Is the N
acid Is the A
{DNA}
Hope that helps :)
boron phosphite
Formula please help fast please please help me please please help
Answer: The formula for boron phosphite is BP
Explanation:
The answer would be BP
Hope this helped!
Calculate the number of moles in 35.7 g of CH4
Answer:
[tex]\boxed {\boxed {\sf About \ 2.23 \ moles \ CH_4}}[/tex]
Explanation:
First, find the molar mass of CH₄
This compound is made of carbon (C) and hydrogen (H). Look on the Peirodic Table for the masses of both elements.
Carbon: 12.011 g/molHydrogen: 1.008 g/molNow, count the number of moles in the compound. There is no subscript on C, indicating 1 mole. There is a subscript of 4 on H, indicating 4 moles. We must multiply the molar mass of hydrogen by 4.
1 Carbon: 12.011 g/mol 4 Hydrogen: (4 * 1.008 g/mol)= 4.032 g/molAdd the 2 masses.
12.011 g/mol + 4.032 g/mol = 16.043 g/molNext, find the number of moles in 35.7 grams.
Use the molar mass of CH₄ as a ratio.
[tex]\frac{16.043 \ g \ CH_4}{1 \ mol \ CH_4}[/tex]
Since we want the units of grams CH₄ to cancel when we multiply, we must flip the ratio.
[tex]\frac{1 \ mol \ CH_4}{16.043 \ g \ CH_4}[/tex]
Multiply by 35.7 grams.
[tex]35.7 \ g \ CH_4 *\frac{1 \ mol \ CH_4}{16.043 \ g \ CH_4}[/tex]
The grams of CH₄ will cancel each other out. Since there is a 1 in the numerator, we can also move 35.7 to the numerator.
[tex]35.7 *\frac{1 \ mol \ CH_4}{16.043 }[/tex]
[tex]\frac{35.7 \ mol \ CH_4}{16.043}[/tex]
[tex]2.22526959 \ mol \ CH_4[/tex]
The original measurement given, 35.7 grams, has 3 significant figures (3, 5, and 7), so we must round to 3 sig figs.
For this number, it is the hundredth place.
The 5 in the thousandth place tells us to round the 2 to a 3.
[tex]2.23 \ mol \ CH_4[/tex]
There are about 2.23 moles of CH₄ in 35.7 grams.
What do the cells do with the things they absorb
Answer:
Use them as nutrients probably
1. The diagram models the forces acting on a box. 2N 2N- Box - 2 N 5 N Which of the following best describes the motion of the box?
Answer: The box is moving downward with increasing speed.
Explanation:
The diagram models the forces acting on a box. 2N 2N- Box - 2 N 5 N .The box is moving downward with increasing speed best describes the motion of the box.
What forces act on a box?The normal force acting on the box is equal to and opposite to its weight. This term equals the force of gravity when the box is on a level surface. To calculate the normal force of the box, use our given mass and gravity's acceleration.
When an object interacts with another object, it experiences a push or pull that causes it to change state, either from rest to uniform motion. It is a magnitude and direction vector quantity.
A representation of the forces acting on the object. The object is represented by a dot, and forces are represented by arrows pointing away from the dot. Force diagrams are another name for them.
Thus, The box is moving downward with increasing speed best describes the motion of the box.
To learn more about the force, follow the link;
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The energy that plants need for photosynthesis comes from
OA.
minerals,
OB. sunlight
OC.
oxygen
OD.
water.
Answer:
OB sunlight
Explanation:
it grows with it
What is the potential energy of a 5 kg apple that is sitting on a 1.5 m high
tree branch? GPE=ham
Answer:
PE = 73.58 J
Explanation:
Given data:
Mass of apple = 5 Kg
Height of tree = 1.5 m
Potential energy = ?
Solution:
Formula:
PE = mgh
g = 9.81 m/s
by putting values,
PE = 5 Kg × 9.81 m/s × 1.5 m
PE = 73.58 J (Kgm²/s = J)
What is an intramolecular force?
Answer:
D. A force acting between the atoms within a molecule.
Many of the lunar craters are due to volcanic eruptions true or false
Answer:
false
Explanation:
Craters on the Moon are caused by asteroids and meteorites colliding with the lunar surface. The Moon's surface is covered with thousands of craters. ... It also has very little geologic activity (like volcanoes) or weathering (from wind or rain) so craters remain intact from billions of years.
A rectangular box has the following dimensions on the inside: 5 cm x 5 cm x 10 cm. What volume can the box hold, in milliliters?
- 20 mL
- 259 mL
- 25 mL
- 50 mL
Answer:
The volume in milliliters is 250mL
Explanation:
The volume of a rectangle is obtained using the equation:
Volume = Length * Width * Height
In the problem, we can take length as 5cm, width as 5cm and height as 10cm. Thus, volume of the rectangular box is:
Volume = 5cm * 5cm * 10cm
Volume = 250cm³
1mL = 1cm³.
That means the volume in milliliters is 250mL
Convert 2.5x10^6mm to km
Answer:
2.5 kilometers
Explanation:
Energy is the ability to do __________.