Week 1 Lecture: Elements And Atoms

Question 0

What is an atom?

Answer 0

The smallest particle in an element that retains the characteristics of that element.

Question 1

What are elements made up of?

Answer 1

Atoms.

Question 2

What is the nucleus of an atom?

Answer 2

Inner dense region. That contains protons and neutrons.

Question 3

What are subatomic particles?

Answer 3

They are protons, neutrons and electrons.

Question 4

What charge does the nucleus have?

Answer 4

Positively charged.

Question 5

Where is the volume of the electrons?

Answer 5

It is occupied by the electrons in the extranuclear region.

Question 6

What is an atom’s whole charge?

Answer 6

It is neutral.

Question 7

Why is the charge of an atom neutral?

Answer 7

Number of proton=number of electrons.

Question 8

What is the charge of an electron?

Answer 8

-1

Question 9

What is the relatively mass of an electron?

Answer 9

1

Question 10

What is the actual mass of an electron?

Answer 10

9.109x1028

Question 11

What are the electrical changes of an atom?

Answer 11

Positive/negative charges repel. Unlike charges attract.

Question 12

What is the atomic number represented by?

Answer 12

Z

Question 13

What is the atomic number?

Answer 13

Number of protins in its nucleus.

Question 14

What is mass number represented by?

Answer 14

A

Question 15

What is mass number?

Answer 15

The number of protons and the number of neutrons in its nucleus.

Question 16

What are naturally occurring isotopes of the elements?

Answer 16

Isotopes are atoms of an element that have the same number of protons and electrons but a different number of neutrons.

Question 17

How many isotopes may a chemical have?

Answer 17

2-10 isotopes.

Question 18

What is atomic mass

Answer 18

Average mass of all the naturally occurring isotopes of an element.