Question

(a) what is the atomic number of copper? (b) what is the atomic number of nitrogen? (c) what is the atomic number of phosphorus?

Explanation:

Step1: Recall atomic number facts

Atomic numbers are fixed for elements. Copper's atomic number is a known value.

Step2: Recall nitrogen's atomic number

Nitrogen also has a specific atomic number in the periodic - table.

Step3: Recall phosphorus's atomic number

Phosphorus has its own unique atomic number.

Answer:

(a) 29
(b) 7
(c) 15