atoms

Question 1

What is an atom made up of?

Answer 1

A nucleus with protons and neutrons and electrons surrounding it

Question 2

atomic number

Answer 2

the number of protons in the nucleus of an atom in that element. protons and electrons are equal in neutral atoms and unequal in ions

Question 3

ion

Answer 3

atoms with negative or positive charge

Question 4

mass number

Answer 4

the total number of protons and neutrons in an atom

Question 5

isotopes

Answer 5

atoms of the same element that have the same atomic number but different atomic masses due to a different number of neutrons. they also have different mass numbers

Question 6

atomic mass

Answer 6

weighted average mass of the atoms in a naturally occurring sample of the element

Question 7

atomic mass unit

Answer 7

amu, one twelfth of the mass of a carbon - 12 atoms

Question 8

Period

Answer 8

The horizontal row of the periodic table. There are currently 7 periods.

Question 9

Group

Answer 9

The vertical column of the periodic table. There are currently 18 groups.