History Of The Atom And Periodic Table

Question 0

Indirect evidence

Answer 0

Evidence gathered without seeing or touching an object

Question 1

Nucleus

Answer 1

The center of the atom

Question 2

Subatomic particle

Answer 2

Particles smaller than an atom

Question 3

Atomic mass unit

Answer 3

Special unit used to measure a subatomic particle AMU

Question 4

Model

Answer 4

Mental picture made using the familiar ideas to explain unfamiliar facts

Question 5

Groups/families

Answer 5

Columns going up and down grouping elements by valence electrons

Question 6

Atomic number

Answer 6

Number of protons in an atom

Question 7

Atomic mass

Answer 7

Average of the existing isotope

Question 8

Periods

Answer 8

Rows across indicating the number of energy levels(ring)

Question 9

Isotope

Answer 9

An element with matching protons but differing number of neutrons

Question 10

Mass number

Answer 10

The most common isotope that indicates the number of protons and neutrons in the nucleus

Question 11

Valence electrons

Answer 11

Electrons on the outer shell/ring

Question 12

Oxidation number

Answer 12

Charge on the ion

Question 13

Democritus

Answer 13

Philosopher asking questions

Question 14

Dalton

Answer 14

Came up with the atomic theory(all things are made from atoms)

Question 15

J.J. Thompson

Answer 15

Plum pudding model(positive and negative charge) and cathode tube

Question 16

E. Rutherford

Answer 16

Gold foil experiment(positive nucleus in the center)

Question 17

N. Bohr

Answer 17

Said that electron moved in orbit the planets

Question 18

Wave model(schroedinger)

Answer 18

Placed electrons in electron cloud with no exact location

Question 19

D. Mendeleev

Answer 19

Created the periodic table

Question 20

Proton
Location
Mass #
Charge

Answer 20

Nucleus
1 AMU
Positive

Question 21

Neutron
Location
Mass #
Charge

Answer 21

Nucleus
>1AMU
Neutral

Question 22

Electron
Location
Mass #
Charge

Answer 22

Electron cloud
.0006AMU
Negative

Question 23

First ring holds how many electrons

Answer 23

2

Question 24

Second ring holds how many electrons?

Answer 24

8

Question 25

Third ring hold how many electrons?

Answer 25

8 or 18 if number is greater than 20

Question 26

How can you tell if two items are isotopes or different elements

Answer 26

The atomic number (number or protons) if it Is the same it is a isotope

Question 27

Horizontal rows are called what? How many are there How are they arranged(2)

Answer 27

Periods 7 rows Arranged by energy level and atomic number

Question 28

Vertical columns are called what? How many are there How are the arranged

Answer 28

Groups/families 18 rows Arranged by how many valence electrons

Question 29

Why is helium a noble gas

Answer 29

Because noble gasses have full shells/rings and are stable

Question 30

What is the purpose of the zig-zag line

Answer 30

To separate metals and non-metals and have metalloids touching the line

Question 31

Metal

Answer 31

``` Shiny Ductile Malleable Good conductors Left side of the zig zag ```

Question 32

Non-metals

Answer 32

``` Dull Powdery Brittle Right side of the periodic table Poor conductors ```

Question 33

Why do atoms bond use the word noble gases

Answer 33

Stone bond to become stable with a full shell noble gases don't bond because they have full shells and are stable