YR 1

Question 1

Atom

Answer 1

the smallest unit of an element
-> consist of electrons organized in orbitals/shells and a nucleus made from
protons and neutrons
Subatomic Particle

Relative mass Charge
Proton 1 +1
Neutron 1 0
Electron 1/2000 -1

Question 2

Element:

Answer 2

same kind of atoms (same atomic number)

Question 3

Isotopes:

Answer 3

atoms with same number of protons but different number of neutrons

(same element: same atomic number but different mass number)

Question 4

Relative Atomic mass Ar

Answer 4

Is the average (weighted) mass of an element’s isotopes relative to 1/12 the
mass of a 12C atom [no unit]