Atomic Structure N5 U1 P2

Question 1

Periodic table arrangement

Answer 1

Order of increasing atomic number
Determines metal and non-metal

Question 2

Groups

Answer 2

Columns
Same number of outer electrons
Same valency
Similar chemical properties

Question 3

Atomic structure

Answer 3

Nucleus- protons, neutrons
Energy levels- electrons

Question 4

Subatomic particles

Answer 4

Neutrons- nucleus, neutral charge, 1 amu
Protons- nucleus, positive charge, 1amu
Electrons- energy levels, negative charge, almost 0 amu

Question 5

Atomic number

Answer 5

=Proton number

Question 6

Neutral atom

Answer 6

Number of protons= number of electrons

Question 7

Nuclide notation

Answer 7

Mass number
Symbol
Atomic number
Mass number= proton no.+electron no.
Atomic no.=proton no.

Question 8

Isotopes

Answer 8

Atoms with same atomic number, different mass numbers
Atoms with same number of protons, different number of neutrons
Most elements have two or more isotopes

Question 9

Relative atomic mass

Answer 9

=average mass of isotopes

Question 10

Main groups- periodic table

Answer 10

Group -Alkali metals
Group 2-Alkali earth metals
Group 7- Halogens
Group 0/8- Noble gases