Atomic structure and the periodic table.

Question 1

Give the radius of an atom.

Answer 1

0.1 nanometers 1x10^-10

Question 2

Where is the nucleus?

Answer 2

Middle of the atom.

Question 3

What does the nucleus contain?

Answer 3

Protons and neutrons.

Question 4

Give the radius of the nucleus.

Answer 4

1x10^-14 1/10000 of radius of an atom.

Question 5

What is the charge of a neutron and why?

Answer 5

positive because of the protons.

Question 6

Where is all of the mass of the atom concentrated in?

Answer 6

Nucleus.

Question 7

Where are electrons?

Answer 7

They move around the nucleus in electron shells.

Question 8

What is the charge on a electron?

Answer 8

Negatively charged and tiny but they cover a lot of space.

Question 9

What do the volume of electron orbits determine?

Answer 9

The size of the atom.

Question 10

What is the mass of an electron?

Answer 10

They have virtually no mass.

Question 11

Relative mass of proton neutron and electron.

Answer 11

1
1
very small

Question 12

Charge of proton neutron and electron.

Answer 12

+1
0
-1

Question 13

What is the charge of an atom?

Answer 13

They are neutral they have no overall charge unlike ions. This is because have same number of protons electrons

Question 14

What is the charge on the electron the same size as?

Answer 14

The charge on the protons, but opposite so the charge cancels out.

Question 15

Why does an ion have an overall charge?

Answer 15

The number of protons does not equal the number of electrons.

Question 16

Give an example of an ion.

Answer 16

An ion with 2- charge has two more electrons than protons.

Question 17

What is an ion?

Answer 17

An atom or group of atoms that has lost or gained electrons.

Question 18

What does the nuclear symbol of an atom tell you?

Answer 18

It’s atomic (proton) number and mass number

Question 19

What does the atomic number tell you?

Answer 19

How many protons there are.

Question 20

What does the mass number tell you?

Answer 20

Total number of protons and neutrons in the atom

Question 21

How to calculate the number of neutrons?

Answer 21

Atomic number - mass number

Question 22

Define the term element

Answer 22

A substance made up of atoms that all have the same number of protons in their nucleus.

Question 23

What does the number of protons decide?

Answer 23

The protons in nucleus decide what type of atom it is.

Ex= an atom with one proton in its nucleus is hydrogen and and atom with two protons is helium.

Question 24

How many elements are there?

Answer 24

About 100
So all atoms of a particular element have same number of protons and different elements have atoms with different number of protons.