Atomic Structure

Question 1

Atoms

Answer 1

The smallest particles of an element that consists of electrons surrounding a nucleus that contains protons and neutrons

Question 2

Molecule

Answer 2

A group of two or more atoms chemically joined together forming an identifiable unit which retains the properties and composition of the substance

Question 3

Proton

Answer 3

Relative charge: +1
Relative mass: 1

Question 4

Neutron

Answer 4

Relative charge: 0
Relative mass: 1

Question 5

Electron

Answer 5

Relative charge: -1
Relative mass: 1/1836

Question 6

Atomic number

Answer 6

The number of protons in the nucleus of an atom

Question 7

Mass number

Answer 7

The sum of the number of protons and neutrons in the nucleus of an atom

Question 8

Isotopes

Answer 8

Atoms of the same element contain te same number of protons and electrons but a different number of neutrons. Therefore, they have the same atomic number but a different mass number

Question 9

Relative atomic mass (Ar)

Answer 9

Weighted average mass of one atom of an element, taking into account the abundance of all the isotopes of that element. It is measured as a ration 1/12 of the mass of an atoms of carbon -12

Question 10

Relative atomic mass (Ar) equation

Answer 10

Ar = (% of isotope a x mass of isotope a) + (% isotope b x mass of isotope b) / 100

Question 11

Period

Answer 11

These are the horizontal rows that show the number of shells of electrons an atom has and are numbered 1-7

Question 12

Group

Answer 12

These are the vertical columns that show how many outer electrons each atom has and are number from 1-7

Question 13

What is the electronic configuration

Answer 13

2,8,8