Final Exam

Question 1

Mass

Answer 1

N + P

Question 2

Atomic Number

Answer 2

of P

Question 3

Atomic Mass

Answer 3

Average mass of Isotopes

Question 4

Isotope

Answer 4

Change in N

Question 5

All atomic masses were measured relative to what? Why?

Answer 5

carbon-12 because its a whole number

Question 6

How to find number of electrons

Question 7

Dalton’s Atomic Theory

Answer 7

1. All matter is composed of extremely small particles called atoms
2. The atoms of one element is identical throughout, but different to another element
3. Atoms of different elements combine in ratios to form compounds
4. In chemical equations they are separated, rearranged and recombined

Question 8

Thompson plum pudding theory

Answer 8

Positive charged spongy mass with electrons in it

Question 9

Bohr’s Postulates

Answer 9

1. The hydrogen atom had only certain energy levels. further orbit orbit = higher energy
2. If an electron moves in an allowed orbit or stationary state the electron did not radiate or absorb energy
3. If it did absorb or emit energy, it moves to another energy level

Question 10

Ionization Energy

Answer 10

Minimum amount of energy required to remove an electron from a gaseous atom or ion

Question 11

Electron negativity

Answer 11

The relative ability of bonded atoms to attract shared electrons to itself