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

molecules

Answer 3

the smallest particle of an substance that can exist. It is composed of two or more atoms.

Question 4

compounds

Answer 4

a substance made of 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 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