Protons, Neutrons And Electrons

Question 1

What is the atomic number?

Answer 1

The number of protons

Question 2

What is the mass number?

Answer 2

No. of PROTONS + No. Of NEUTRONS

Question 3

In an atom, what is the number of electrons equal to?

Answer 3

The number of protons

Question 4

What does the nucleus of an atom contain?

Answer 4

Protons and neutrons

Question 5

What does the electrons do in an atom?

Answer 5

Orbits around the nucleus

Question 6

In a periodic table, next to the chemical symbol, where is the mass number positioned in relation to the atomic number?

Answer 6

The mass number is ABOVE the atomic number

The atomic number is BELOW the mass number

Question 7

In an atom, how many electrons can the 1st energy level hold?

Answer 7

2 electrons

Question 8

In an atom, how many electrons can the 2nd energy level hold?

Answer 8

8 electrons

Question 9

In an atom, how many electrons can the 3rd energy level hold?

Answer 9

The 3rd energy level is stable with 8 electrons, but it can hold more.

Question 10

Why are noble gas atoms so stable?

Answer 10

Because they all have a complete outer shell of electrons