Atoms

Correctly match the protons, neutrons and electrons.

• + charge particles found in the nucleus

• electrons

• particles with no charge in the nucleus

• protons

• • - charge particles on electron cloud

• neutrons

Tags

NGSS.MS-PS1-1

Mass number equals the number of protons plus the number of _______.

• protons

• electrons

• neutrons

• isotopes

The smallest particles of matter that make up matter.

• atoms

• protons

• energy levels

• nucleus

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Isotopes have

• same # of neutrons

• different # of neutrons

• different # of protons

• different # of electrons

What is the core of an atom called?

• neutron

• electron cloud

• elements

• nucleus

The identity of an element is determined by the number of _________.

• protons

• electrons

• neutrons

• element

How many maximum electrons does the first energy level of an electron cloud hold?

How many maximum electrons does the second energy level of an electron cloud hold?​ (a)  

• 8
• 2
• 18
• 10

How many maximum electrons does the first energy level of an electron cloud hold?

The average mass of the elements isotope, weighted according to the abundance of each isotope

• periodic table of elements

• atom

• atomic number

• average atomic mass