Atomic Structure

The positively charged particle in an

atom’s nucleus is the

• electron

• neutron

• proton

• isotope

An element’s identity can be

determined from its

• atomic number

• number of neutrons

• number of isotopes

• energy levels

The smallest particle an element can

be divided into is the

• electron

• neutron

• isotope

• atom

An element’s ______________________ tells the number of protons in its nucleus.

• atomic mass

• symbol

• name

• model

What three particles are found in an atom? select all that apply

• electron

• proton

• neutron

• dust

Tags

NGSS.MS-PS1-1

Which two particles are found in an atom’s nucleus?

• proton and electron

• proton and neutron

• electron and neutron

• mitochondria and cytoplasm

What two particles account for almost all of the mass of an atom?

• neutron and proton

• neutron and electron

• electron and proton

• iron and protein

A particle with no charge is a(n) .

• electron

• proton

• neutron

• nucleus

The is the very small, dense center of an atom.

• neutron

• proton

• electron

• nucleus

Mass number is

• protons + electrons.
• protons + neutrons.
• electrons + neutrons.