Chem Chapter 2 Study Cards

Question 1

1808

Answer 1

Dalton proposed the atomic theory of matter

Question 2

1897

Answer 2

Thomson described the atom by using the “raisin bun model”

Question 3

1922

Answer 3

Bohr proposed that electrons orbit the nucleus in shells

Question 4

1935

Answer 4

Chadwick discovered that the nucleus contains protons and neutrons

Question 5

4 atom diagrams

Answer 5

Thomson, nagota, bohr and quantum

Question 6

Family 1-18

Answer 6

Each vertical column, have very similar chemical properties and characterisctics

Question 7

Period 1-7

Answer 7

Each horizontal row on the table

Question 8

Mass number

Answer 8

represents the sum of the number of protons and neutrons in an atom

Question 9

Atomic number

Answer 9

Shows how many protons are in the nucleus of one atom

Question 10

How to calculate for neutrons

Answer 10

Mass number - atomic number= neutrons

Question 11

Metals

Answer 11

shiny, malleable and ductile

Question 12

Non-metals

Answer 12

solid or gas and are dull,brittle insulators

Question 13

Metalloids

Answer 13

both non mateallic and metallic properties

Question 14

Alkali metals

Answer 14

most reactive metals

Question 15

Alkaline-earth metals

Answer 15

reactive but not as reactive as alkali metals

Question 16

Halogens

Answer 16

most reactive non-metals

Question 17

Noble gases

Answer 17

most stable and unreactive elements

Question 18

Stable octet

Answer 18

when an atom has 8 electrons in the outer shell of the nucleus