Paper 1 Atoms & Isotopes

Question 1

How big are Atoms?

Answer 1

Atoms:

. VERY SMALL RADIUS of atmoun 1 x 10-10 metres

Question 2

What are atoms made up of?

Answer 2

Atoms are made up of:

. Positively charged NUCLEUS made up of PROTONS & NEUTRONS - surrounded by NEGATIVELY charged ELECTRONS

Question 3

Charge of Atoms?

Answer 3

Atoms have no overall electrical charge

as equal number of electrons and protons

Question 4

Isotope

Answer 4

Isotopes
. have DIFFERENT NEUTRONS (top)
. have SAME number of PROTONS (bottom)

14C 12C
6 6

Mass on the top
Atomic Number on the bottom

Question 5

What were atoms once thought to be?

Answer 5

Atoms were once thought to be tiny spheres that could not be divided

Question 6

What discovered the electron?

Answer 6

.JJ THOMPSON discovered the electron in 1897.

.Led to Plum Pudding Model - atom as a BALL of charge with ELECTRONCS embedded in iit

Question 7

What electrical charge does a proton have?

Answer 7

Protons have an electrical charge of +1

Question 8

What charge does an electron have?

Answer 8

An electron has a charge of -1