atoms elements compounds and molecules

Question 1

atom

Answer 1

the smallest part 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 up 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 from atoms from two or more elements

Question 5

proton

Answer 5

a particle of matter that has a positive electrical charge and forms part of the nucleus of an atom

Question 6

neutron

Answer 6

a particle of matter that has no electrical charge and forms part of 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

number of protons. top number in the element box

Question 9

mass number

Answer 9

number of protons plus neutrons. bottom number in the element box

Question 10

chemical symbol

Answer 10

a one of 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