Atoms and the Periodic Table

Most of the mass of an atom is found in its

• nucleus

• electron cloud

• atomic number

• plum pudding model

Tags

NGSS.MS-PS1-1

A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is

• 26

• 30

• 52

• 56

Tags

NGSS.MS-PS1-1

Each row in the periodic table ends with a

• metal

• nonmetal

• metalloid

• noble gas

Dot diagrams are used to represent

• atomic numbers

• atomic mass

• isotopes

• outer level electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Particles of matter that make up protons and neutrons are

• electrons

• isotopes

• quarks

• atoms

Tags

NGSS.HS-PS1-8

A chemical symbol represents the ____________ of an element.

• name

• reaction

• group

• structure

Horizontal rows of the periodic table are called

• clusters

• groups

• families

• periods

Atoms of the same element with different numbers of neutrons are called

• metals

• isotopes

• metalloids

• radioactive elements

A particle that moves around the nucleus is a(n)

• electron

• proton

• neutron

• quark

Tags

NGSS.MS-PS1-1

Protons are parts of an atom that are inside the nucleus and hold what type of charge?

• no charge

• negative

• positive

• both positive and negative