Atoms

 What is the mass number of this element?

• 5

• 27

• 32

• 59

Tags

NGSS.MS-PS1-1

What is the mass number?

• the number of protons

• the sum of the number of protons and the number of neutrons in the nucleus of an atom 

• the number of electrons

• the number of neutrons

a neutron has this charge

• negative

• positive

• neutral

Which statement best describes an electron?

• Smaller mass than a proton and a negative charge

• Smaller mass than a proton and a positive charge

• Greater mass than a proton and a negative charge

• Greater mass than a proton and a positive charge

Tags

NGSS.MS-PS2-3

An atom has a mass number of 36 and an atomic number of 16, how many neutrons does the atom have?

• 36

• 20

• 16

• 6

How many electrons does potassium K contain? (click to see image)

• 19

• 39

• 20

• 40

Tags

NGSS.MS-PS1-1

If my atomic number is 19. Then what element would I be and how many protons would I have.

• Fluorine and 9

• Magnesium and 12

• Potassium and 19

• Krypton and 19

______ always gives the identify of the atom.

• Protons

• Neutrons

• Electrons

What is the atomic number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

A neutron has a neutral charge and a mass of ____ amu.

• 0

• 1

• <1

• >1