Topic 1 Key Concepts In Chemistry

Question 1

Atoms

Answer 1

the smallest part of an element that can exist all substances are made up of atoms

Question 2

atomic number

Answer 2

the number of protons in the nucleus

Question 3

compound

Answer 3

a substance made up[ of two or more types of atoms chemically bonded

Question 4

Covalent bond

Answer 4

a shared pair of electrons

Question 5

electron

Answer 5

nehatiavly charged subatomic particle which orbit the nucleus at various energy levels ver small relative mass

Question 6

Element

Answer 6

a substance made up of only one type of atom

Question 7

Emperical formula

Answer 7

the simplest whole number ratio of atoms of each element in a compound

Question 8

Intermolecular forces

Answer 8

the forces which exist between molecules the strength of the intermolecular forces impact physical properties like boiling/melting point

Question 9

mass number

Answer 9

the total number of protons and neutrons in the nucleus

Question 10

neutron

Answer 10

neutral subatomic particle present in the nucleus atom relative mass of 1

Question 11

period (periodic table)

Answer 11

a row of the periodic table elements in the same period have the same electron shells