Show:
SigFigs
Isotopes
Atomic Structure
Atomic models
Practice
100

Non-Zero Digits EX:1,234

Is a Significant Figure

100

What is an Isotope

Atom of an element containing an equal amount of protons but different amounts of neutrons.

100

Basics of an atom

Protons

Neutrons

Electrons

100
In 400 BC Democritus made this atomic model.

Hard-Sphere

100

Oxygen has _ protons, 10 Neutrons, and a mass of 18

how many protons are there?

8 protons

200

Leading Zeros Ex: 0.00111

Not a Significant Figure

200

do Isotopes have different weights?

YES

200

Mass Number

# of Protons + # of Neutrons 

200

The planetary model was created in 1913 by...

Bohr

200

the number 0.0005 contains this amount of SigFigs

1 SigFig

300

Trailing Zeros: Ex: 2.00 or 570,000

Only Significant when there's a decimal

300

How do you calculate the average atomic mass?

(atomic mass x the natural abundance) + (atomic mass x the natural abundance) (then cry with sigfigs)

*NOTE: when putting the natural abundance do NOT put the percentage remember to turn it to a normal decimal (divide by 100)

300

Orbital

Area defining the location of an electron

300

Thomson created Plum Pudding Model in what year?

1904

300

Carbon-13 has this many neutrons

7 neutrons

400

Adding and Subtracting SigFigs

Results must have the same number of decimal places as the least precise initial value

400
The difference between Atomic mass and Average Atomic mass.

Atomic Mass: Protons + Neutrons

Average Atomic Mass: Isotopic Mass x Percent Abundance + any other Isotope of that element

400

Atomic number

# of Protons

400

Ruthford created this model in 1911.

The Nuclear Model

400

rounded to 1 SigFig the number 7,492.85 turns into what?

7,000

500

Multiplying and dividing SigFigs

Results must have the same number of Significant Figures as the initial value

500

Rubidium has 2 Isotopes: 

(86.9u x 0.28) + (84.9u x 0.72) = 85.46u

what is the correct amount of sigfigs?

85.5u

500

Held in the Nucleus

Protons and Neutrons

500

Who created the quantum model and in what year?

Schrödinger in 1920.

500

8088 x 0.4 = 3235.2 in the correct SigFig

3000