1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Keith_Richards [23]
3 years ago
14

How many electrons does the predictable (most common) ion of calcium contain?

Chemistry
1 answer:
Vadim26 [7]3 years ago
3 0
Answer: 18

Justification:

1) The most common ion of calcium is Ca 2+

2) That means that the atom, neutral calcium, has lost two electrons.

3) The atomic number of calcium is 20.

4) Atomic number is the number of protons, so calcium has 20 protons.

5) Therefore, the neutral atom of calcium also has 20 electrons (to make a net charge of zero).

6) Then, the ion Ca 2+ has 20 - 2 = 18 electrons.

Answer: 18 electrons.
You might be interested in
What is the pH of a solution with a concentration of 1.8 × 10-4 molar H3O+?
Andre45 [30]
PH is defined as the negative log of Hydrogen ion concentration. Mathematically we can write this as:

pH=-log[H^{+}]=-log[H_{3}O]

We are given the concentration of H_{3}O. Using the value in formula, we get:

pH=-log[1.8*10^{-4}]=3.745

Therefore, the pH of the solution will be 3.745
8 0
3 years ago
If 12.5 grams of the original sample of cesium-137 remained after 90.6 years, what was the mass of the original sample?
myrzilka [38]

Answer:

Mass of original sample = 100 g

Explanation:

Half life of cesium-137 = 30.17 years

t_{1/2}=\frac {ln\ 2}{k}

Where, k is rate constant

So,  

k=\frac{\ln2}{t_{1/2}}

k=\frac{\ln2}{30.17}\ year^{-1}

The rate constant, k = 0.02297 year⁻¹

Time = 90.6 years

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Initial concentration [A_0] = ?

Final concentration [A_t] = 12.5 grams

Applying in the above equation, we get that:-

12.5\ g=[A_0]e^{-0.02297\times 90.6}

[A_0]=\frac{12.5}{e^{-0.02297\times 90.6}}\ g=100\ g

<u>Mass of original sample = 100 g</u>

8 0
2 years ago
What is the only force that can act on an object in free fall?
balandron [24]
The answer is gravity
5 0
2 years ago
Read 2 more answers
PLEASE HELP!!!!
coldgirl [10]

Answer:

1.2 liters.

Explanation:

Focus on the 4th digit: that's the ones column. The 3rd digit is the decimal place, just be sure to round up.

7 0
3 years ago
Which is an example of a polymer?
g100num [7]

Answer:

diamond

Explanation:

5 0
2 years ago
Other questions:
  • Find the potential difference required to accelerate protons from rest to 10% of the speed of light. (at this point, relativisti
    14·1 answer
  • It takes 11.2 kj of energy to raise the temperature of 145 g of benzene from 22.0°c to 67.0°c. what is the specific heat of benz
    12·1 answer
  • Why do different chemicals emit different colors of light, and why is the color emitted specific to that chemical?
    13·1 answer
  • The atoms and molecules that move the most quickly.
    11·2 answers
  • Provide three different types of examples of how minerals form on earth
    5·1 answer
  • Pls help me <br> brainliest, rattings etc<br> its 2 questions and I am very confused!<br> 8 pts!
    5·2 answers
  • What can be created with differential weathering
    8·1 answer
  • PLEASE ANSWER!
    8·1 answer
  • Atoms of which element have the most valence electrons?  A. Nitrogen (N)  B. Sodium (Na)  C. Oxygen (O)  D. Calcium (Ca)
    8·1 answer
  • 3-continuous strand of fibers that have been spun together A-Textile B- Warp C-Weft D-Yarn​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!