Atomic Mass and Number

What is the Atomic Number of Nitrogen?

• 7

• 14.007

• 14

• 21

What is the Atomic Mass of Nitrogen?

• 7

• 14.007

• 14

• 21

What is the Mass Number of Nitrogen?

• 7

• 14.007

• 14

• 21

How many electrons are in an atom of Nitrogen?

• 7

• 14.007

• 5

• 2

How many VALENCE electrons are in an atom of Nitrogen?

• 7

• 14.007

• 5

• 2

How many energy levels of electrons are in an atom of Nitrogen?

• 7

• 14

• 5

• 2

How many electrons are in the first energy level of an atom of Nitrogen?

• 7

• 14

• 5

• 2

How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)

• Sodium has 1 proton.

• Sodium has 3 protons.

• Sodium has 11 protons

An element has the mass number 12 and atomic number 6. The number of neutrons in it is:

• 6

• 10

• 4

• 8

How many neutrons does C-14 [atomic #6] contain? (tap to enlarge the image)

• 6

• 7

• 14

• 8