atomic structure

Question 1

What is meant by the term atom?

Answer 1

a neutral particle made up of protons and neutrons in the nucleus with electrons surrounding it

Question 2

What is meant by the term molecule?

Answer 2

two or more atoms covalently bonded together. molecules contain a certain fixed number of atoms

Question 3

What are the 3 sub-atomic particles in atoms and where are they in it

Answer 3

Protons - nucleus
neutrons - nucleus
electron - in the shells/clouds

Question 4

what is the relative mass and charge of a proton

Answer 4

1

+1

Question 5

what is the relative mass and charge of an electron

Answer 5

1/1836——0

-1

Question 6

what is the relative mass and charge of a neutron

Answer 6

1

0

Question 7

What is meant by the term atomic number

Answer 7

the number of protons in an atom

Question 8

What is meant by the term mass number

Answer 8

the total number of protons and neutrons in the nucleus of an atom

Question 9

What is meant by the term isotopes

Answer 9

different atoms of the same element, with the same number of protons but a different number of neutrons. Isotopes have the same chemical properties

Question 10

What is meant by the term RAM

Answer 10

the weighted average mass of the isotopes of the element

Question 11

How do you calculate the RAM of an element from isotopic abundances

Answer 11

taking the percentages of the 2 different isotopes

then times the percentage by the RAM of both the isotopes then divide it all by 100

Question 12

what is the electronic configuration of potassium(19) and why

Answer 12

2,8,8,1
4th period
1st group

Question 13

why do elements in the same group have similar chemical properties?

Answer 13

due to the same number of electrons in the outer shell and the charge — need to receive/lose the same number of electrons — similar reactions