Unit 1 Chemistry

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

Tags

NGSS.HS-PS1-8

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

• isotope
• plastic
• atom
• metal

Tags

NGSS.MS-PS1-1

What subatomic particles are located in the electron cloud?

• quarks
• protons
• electrons
• neutrons

Tags

NGSS.MS-PS1-1

Which subatomic particle has a negative charge in the atom?

• proton
• neutron
• electron
• quark

Which is an electron?

• A
• B
• C

Tags

NGSS.MS-PS1-1

Which is a proton?

• A
• B
• C

Tags

NGSS.MS-PS1-1