Question 1

smallest unit of matter

Accepted Answer

atom

Question 2

the center of the atom that contains neutrons and protons; where most of the mass of an atom is located

Accepted Answer

nucleus

Question 3

the outer portion of an atom that contains electrons; where most of the volume of an atom is located

Accepted Answer

electron cloud

Question 4

neutrally charged subatomic particles with a mass of 1 amu; located in the nucleus

Accepted Answer

neutron

Question 5

positively charged subatomic particles with a mass of 1 amu; located in the nucleus

Accepted Answer

proton

Question 6

the average mass of all atoms of an element

Accepted Answer

atomic mass

Question 7

the rounded mass of an atom; protons + neutrons

Accepted Answer

mass number

Question 8

the number of protons in an atom; the number that identifies an element

Accepted Answer

atomic number

Question 9

describes the ratio of the atoms of a particular substance (water = H2O)

Accepted Answer

chemical formula

Question 10

A subatomic particle that has a negative charge

Accepted Answer

Electron

Question 11

the chart scientists use to organize and classify all the known elements

Accepted Answer

Periodic Table of Elements

Question 12

One or two letters that represent element.

Accepted Answer

element symbol

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