In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

All matter is made of

• energy

• atoms

• air

• chemistry

Tags

NGSS.MS-PS1-1

The atomic number of an element tells the number of _____ in the nucleus of an atom of that element.

• protons
• neutrons
• electrons
• isotopes

Tags

NGSS.HS-PS1-7

Most of the mass of an atom is found it its _____.

• electron cloud
• nucleus
• atomic number
• empty space

An element is made up of only one kind of _____.

• isotope
• plastic
• atom
• metal

Which subatomic particle has a negative charge in the atom?

• proton

• neutron

• electron

• nucleus

Which is an electron?

• A
• B
• C

Tags

NGSS.MS-PS1-1

Which is a proton?

• A
• B
• C

Tags

NGSS.MS-PS1-1

Which is a neutron?

• A
• B
• C

Tags

NGSS.MS-PS1-1