Question

periodic table element labeling
label an element box with: atomic number, element symbol, atomic mass, number of protons, neutrons, and electr

1. what is the atomic number of nitrogen?
2. how many electrons does carbon have?
3. if an element has an atomic mass of 23 and atomic number of 11, how many neutrons does it have?

Explanation:

Step1: Recall nitrogen's atomic number

Nitrogen's atomic number is a known value from the periodic - table. It is 7.

Step2: Recall carbon's electron number

For a neutral atom, the number of electrons is equal to the atomic number. Carbon has an atomic number of 6, so it has 6 electrons.

Step3: Calculate number of neutrons

The formula to find the number of neutrons $n$ is $n = \text{Atomic mass}-\text{Atomic number}$. Given atomic mass = 23 and atomic number = 11, then $n=23 - 11=12$.

Answer:

1. 7
2. 6
3. 12