Atoms and Ions

Atom

The tiny particles that make up all matter/the smallest part of an element

What are atoms made up of?

Protons, neutrons and electrons

Where are protons are neutrons found?

The central nucleus

Where are the electrons found?

Electron shells around the nucleus

What is the relative mass of a proton?

1

What is the relative mass of a neutron?

1

What is the relative mass of an electron?

1/1836

What is the relative charge of a proton?

+1

What is the relative charge if a neutron?

0

What is the relative charge of an electron?

-1

Atomic number

Number of protons in an atom, small number

mass number

Number of protons and neutrons, bigger number

Isotopes

Atoms of the same element that have the same number of protons but a different number of neutrons

Relative atomic mass (Ar)

The average mass of the isotopes of the element relative mass of 1/12th of a 12C atom

What is the electron shell configuration?

2,8,8,18

Group number

The number of electrons in the outer shell of the atom

Period number

The number of shells