Chemistry- Atomic Structure + periodic table

Question 1

What did JJ Thomson discover and name of model?

Answer 1

Discovered electrons, Plum pudding model (negatively charged particles in a sea of positive charge) 1897

Question 2

What discovery did Ernest Rutherford make, and what model did he come up with?

Answer 2

The atom is mostly empty space with a tiny, dense, positively-charged nucleus. He came up with the nuclear model to show his findings. 1909

Question 3

What experiment did Rutherford carry out?

Answer 3

Gold foil experiment. He fired Alpha particles at thin gold foil, some deflected slightly or went straight through the sheet but some deflected backwards proving that the plum pudding model couldn’t be correct.

Question 4

What discovery did Niels Bohr make?

Answer 4

Electrons orbit the nucleus on shells. If they were in a ‘cloud’ as suggested by Rutherford it would cause the atom to collapse. So electrons orbit on a shell which is a fixed distance from the nucleus

Question 5

What discovery did James Chadwick make?

Answer 5

He discovered neutrons. 1932

Question 6

Why do group 1 elements become more reactive as you go down the group?

Answer 6

The outer electron is further away from the nucleus, So less strongly attracted to the nucleus + is lost more easily

Question 7

Who came up with the periodic table?

Answer 7

Dmitri Mendeleev

Question 8

Properties of transition metals

Answer 8

strong, hard, good conductor, good catalysts