Atoms, Elements, Molecules, and compounds

Question 1

Atom

Answer 1

the smallest particle of an element that can exist

Question 2

Element

Answer 2

a pure chemical substance that cannot be physically split into a more simple substance. each is made of one type of atom. carbon, mercury and hydrogen are examples.

Question 3

Molecule

Answer 3

the smallest particle of a substance that can exist. it is composed of two or more atoms

Question 4

Compound

Answer 4

a substance made of atoms from two or more elements

Question 5

proton

Answer 5

a particle of matter that has positive electrical charge and found in the nucleus of an atom

Question 6

Neutron

Answer 6

a particle of matter that has no electrical charge and found in the nucleus of an atom

Question 7

Electron

Answer 7

a particle of matter that has a negative electrical charge and travels around the nucleus of an atom

Question 8

Atomic number

Answer 8

= the number of protons in an element’s atoms. top number in the element box

Question 9

Mass number

Answer 9

number of protons plus neutrons. bottom numbers in element box

Question 10

Chemical symbol

Answer 10

a one or two letter representation of an element

Question 11

Subscript

Answer 11

tiny number to the right of the element symbol. tells you how many atoms of that element