The Periodic table

Question 1

Atoms’ size increases as you go go from _____ to ________.

Answer 1

left to right

Question 2

Each element has an ___________ ____________.

Answer 2

Atomic number

Question 3

An Atomic number tells us how much __________ are in an atom.

Answer 3

Protons

Question 4

Each element has an ________ ________________

Answer 4

Mass number

Question 5

Mass number tells us how much ______ and _______ are there in total.

Answer 5

Neutrons and Protons

Question 6

Protons have a _________ charge.

Answer 6

Positive

Question 7

Neutrons have ____ charge

Answer 7

no

Question 8

Electrons has ___________ charge.

Answer 8

negative

Question 9

An Atom has an overall ____________ charge.

Answer 9

no

Question 10

The higher the mass number the more ___ the atom has.

Answer 10

mass

Question 11

density:

Answer 11

Density is the measure of mass for a fixed volume of substance. It is given in g/cm(3)

Question 12

The density of iron is ______

Answer 12

7.87g/cm(3)

Question 13

the density of sodium is _______

Answer 13

0.97g/cm(3)

Question 14

The model of _____________ and _______________ is:

(The one where electrons are floating around the neucleas)

Answer 14

J.J Thompson and Ernest Ruthford.

Question 15

But in ________ a scientist named _________ developed Rutherford’s model of the atoms.

Answer 15

1913, Neils Bohr

Question 16

Neil’s idea was?

Answer 16

That instead of the electrons just randomly floating around the nucleus they are in a shell called the electronic shell around the nucleus.

Question 17

Electrons are arranged in ______ ________ around the nucleus.

Answer 17

electronic shells

Question 18

This is called an _________ __________.

Answer 18

electronic structure

Question 19

The first one(K shell) only has room for ____ electrons.

Answer 19

two

Question 20

The second and third electronic shells have room for ________ electrons.

Answer 20

8 electrons

Question 21

The first shell must be _______

Answer 21

full