atomic structure

Question 1

whats an atom?

Answer 1

the smallest piece of an elements that shows its chemical properties

Question 2

whats a molecule?

Answer 2

two or more atoms chemically joined.

Question 3

name 3 sub-atomic particles

Answer 3

-protons–> mass= 1 atomic mass unit/ charge= +1
-neutrons–> mass= 1 atomic mass unit/ charge= 0
-electrons–> mass= 1/1840 /charge= -1

Question 4

important equations?

Answer 4

number of protons + number of neutrons = mass number
no of neutrons = mass num - no of protiens

Question 5

What is the structure of an atom as seen on the periodic table?

Answer 5

If x was the chemical symbol, then the number on top of x is the mass number. The number below x would be an atomic number (the number of protons).

Question 6

whats relative atomic mass?

Answer 6

relative atomic mass is the average mass of a sample which contains isotopes of the same element.

Question 7

What is the equation for Ar?

Answer 7

C- mass number: 12
percentage in a sample = 75%
D-mass number:13
percentage in a sample = 25%
Ar= (1275) + (1325)/100
=12.25