Elements and Atomic Structure

The atomic number identifies the number of __________.

• protons and electrons

• electrons and neutrons

• atoms

• neutrons and protons

Tags

NGSS.MS-PS1-1

Which of the following would change the name of the element if one was added or removed from the atom?

• neutrons

• protons

• valence electrons

• electrons

What is the mass number of Potassium (K) atom that has 20 neutrons?

• 18

• 20

• 19

• 39

The atom that has an atomic mass of 12 has ____________ protons.

• 6

• 8

• 1

• 4

The __________ tells you how many protons an element has.

• atomic number

• atomic mass

• energy levels

• electrons

Tags

NGSS.MS-PS1-1

Where are protons found in an atom?

• The nucleus

• Energy level

• The atomic mass

• By electrons

Tags

NGSS.MS-PS1-1

To find the number of neutrons, you subtract the atomic ________ from the atomic ________.

• mass; number

• number; mass

• electrons; protons

• neutrons; electrons

Tags

NGSS.MS-PS1-1

2. Subatomic particles that have a negative charge

• electrons

• atoms

• protons

• neutrons

The number 16 for the atomic element sulfur is the

• ionic number

• atomic mass

• isotope

• atomic number

An elements in group 18 are non reactive, stable, and inert because

• they have 3 valence electrons and a full outer shell

• they have no valence electrons and a full outer shell

• they have 8 valence electrons and a full outer shell

Tags

NGSS.HS-PS1-1