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100

a theory that states that all matter is composed of tiny particles called atoms

Atomic theory

100
This particle has a positive charge.
What is a proton?
100

Atoms of the same element, but with different numbers of neutrons.

What is an isotope?

100
This element has 20 protons.
What is Calcium?
100

# of p subleves

What is 3

200
This scientist proposed that electrons orbit the nucleus in fixed paths at fixed energy levels just like planets orbit the sun.
What is Niels Bohr?
200

The total number of protons and neutrons in an atom

What is mass number

200
The atomic number is the same as the number of this particle.
What is a proton?
200
This is the mass number of Nitrogen when it has 8 neutrons.
What is 15?
200

Maxmium number of electrons that c an be found in the d sublevels

What is 10

300
This scientist described the atom as the smallest, most indivisible piece of matter and proposed 4 postulates/laws regarding atomic theory.
Who is John Dalton?
300

A method for representing an atom's valence electrons using dots around the element symbol.

Lewis dot structure

300

positive ion

cation

300

negative ion

anion

300

1s2 2s2 3p6 4s2

What is the electron configuration of calcium

400

Thompsons model-the atom is made up of negative particles equally mixed in a sphere of positive materials. is sometimes referred to as

Raisin Bun Model

400

These particles have a relative mass of 1.

What are protons and neutrons?

400
This is the formula for mass number.
What is # of protons + # neutrons?
400

Charge of an atoms that has gained 3 electrons

What is -3

400

[Xe] 6s2 4f14 5d9

What is the electron configuration of Gold

500

Gold foil experiment, discovered nucleus

Rutherford

500
This particle has virtually no mass.
What is an electron?
500
Magnesium-25 has this number of neutrons
What is 13 neutrons?
500

Charge of an atom that has 2 more neutrons than proton

What is neutral

500

Each orbital position can only hold 2 electrons and they must spin in opposite directions.

What is the Pauli Exclusion Principle