Each inner energy level of an atom has a maximum number of ________ it can hold.

• neutrons

• quarks

• electrons

• protons

Dot diagrams are used to represent _______.

• atomic mass

• isotopes

• atomic number

• outer level electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Protons and neutrons are made up of even smaller particles called _______.

• electrons

• quarks

• isotopes

• atoms

The one or two letter chemical symbol represents the _______ of an element.

• name

• group

• structure

• reaction

Horizontal rows of the periodic table are called __________.

• families

• clusters

• groups

• periods

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

• radioactive elements

• metalloids

• metals

• isotopes

The particle that moves around the nucleus is the _________.

• neutron

• proton

• electron

• quark

Elements that are either gases or brittle solids, and are poor conductors at room temperature are ________.

• metals

• metalloids

• isotopes

• nonmetals

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

• 52

• 56

• 30

• 26

Tags

NGSS.MS-PS1-1

The central core of an atom is called the _______.

• hub

• ion

• orbit

• nucleus