Atomic Number and Nucleon number

Atomic number of fluorine

(Hint: Fluorine is in Group 17)

Nucleon number of Cobalt

(Hint: Cobalt is in Group 9)

Proton number of potassium

(Hint: Potassium in Group 1)

Mass number of sulfur

(Hint: Sulfur is in Group 16)

Relative atomic mass of Krypton

(Hint: Krypton is in Group 18)

I am a metal atom. My atomic number is 20.

What am I?

Write your answer in terms of symbol.

I am a non-metal atom. My mass number is 31.

What am I?

Write your answer in symbol.

My chemical symbol is Ar. What is my atomic number?

I am Cu. My atomic number is 29 and my mass number is 64.

How many electrons do I have?

I am Cu. My atomic number is 29 and my mass number is 64.

How many neutrons do I have?