c03 atomic structure

Question 1

what is an atom?

Answer 1

Atom is the smallest particle that still have the chemical characteristics of an element.

Question 2

what are the sub-atomic particles in an atom?

Answer 2

NEUTRON
relative mass=1
relative charge=0

PROTON
relative mass=1
relative charge=+1

ELECTRON
relative mass=1/1840(negligible)
relative charge=-1

Question 3

what is a proton number?

Answer 3

Proton number (Z) is the number of protons in an atom

Question 4

what is a nucleon number?

Answer 4

Nucleon number (A) is the total number of protons and neutrons in the nucleus (usually bigger than the proton number)

Question 5

what is an ion?

Answer 5

Is the particle formed when an atom or group of atoms gains or loses electron but the number of protons and neutrons remain the same.

Question 6

what is an isotope?

Answer 6

Atoms of the same element that have same proton/atomic number but different nucleon/mass numbers.

Question 7

what is a valence shell?

Answer 7

the outermost electron shell