1atomic structure

Question 1

atom

Answer 1

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

Question 2

molecules

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

elements are made of

Answer 3

tiny particle matter called atoms

Question 4

each atom is made of

Answer 4

subatomic particles called protons neutrons and electrons

Question 5

atoms are so tiny that

Answer 5

we can’t compare their masses in conventional units so we use a unit called the relative atomic mass

Question 6

relative mass of proton, neutron and electron

Answer 6

proton- 1
neutron- 1
electron- 1/1840

Question 7

charge of protons neutron and electron

Answer 7

proton- +1
neutron- 0
electron- -1

Question 8

atomic number

Answer 8

The number of protons in the nucleus of an atom

Question 9

mass number

Answer 9

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

Question 10

isotopes

Answer 10

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

Question 11

relative atomic mass (Ar)

Answer 11

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 ratio » of the mass of an atom of carbon-12

Question 12

relative atomic mass =

Answer 12

((isotope abundance 1 x isotope mass 1) x (isotope abundance 2 x isotope mass 2))
/100