Radioactivity 2

Question 1

Atomism, Democritus 5th century BC show?(1)

Answer 1

All matter is composed of small white invisible particles called atoms

Question 2

Solid sphere model, John Dalton, 1803(2)

Answer 2

Atoms are invisible, and compounds are combinations of different types of atoms

Question 3

Plum pudding model, JJ Thompson, 1897(3)

Answer 3

An atom is a sphere, with a positive + negative charge embedded in it

Question 4

Nucleur Model, Ernest Rutherford, 1911(4)

Answer 4

Electrons orbit in a set, predictable path around the fixed positively charged nuclei.

Question 5

Planetary model, Neils Bohr, 1913(5)

Answer 5

Electrons circularly orbit the nucleus.

Question 6

238 234 4
U= Th + He
92 90 2

Answer 6

Alpha decay

Question 7

234 234 0
Th = Pa + e
90 91 -1

Answer 7

Beta decay

Question 8

Gamma decay?

Answer 8

Nothing changes inside the nucleus so no equation