Subatomic Particles
Quantum Mechanics
Electron Configurations
Atomic Numbers
Half Life and Isotopes
100

Three subatomic particles

electron, proton, neutron

100

What are the four subshells and their amount of electrons they can hold? 

s-2, p-6, d-10, and f-14

100

What principle states that electrons must have opposite spins? 

Pauli's principle

100

The sum of protons and neutrons in the nucleus of an atom.

What is mass number?

100

What is an isotope?

atoms that have the same number of protons but differ in their number of neutrons

200

Neutrons are located outside of the nucleus. True or False?

False!

200

Magnetic quantum number (ml) and angular quantum number (l) describe what?

subshells and orientation/orbitals 

200

The ground state electron configuration of Ga is (long way) 

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1

200
The number of protons in an atom of a certain element.
What is atomic number?
200

Cesium-137 has a half-life of 30.0 years. How many years must pass to reduce a 25 mg sample of cesium-137 to 6.25 mg?

60 years

300

When an electron gets excited from the ground state, does it absorb or emit energy? 

Absorbs 

300

All the orbitals in a given electron shell have the same value for the _____ quantum number.

principal

300

How many valence electrons does Ga have? 

3 

300
The atomic number of Oxygen.
What is 8?
300

List the three different forms of radiation 

alpha, beta, gamma 

400

Which form of radiation has a positive charge and why? 

alpha rays composed of protons and neutrons

400

What subshell does the quantum number 3 define? 

f subshell 

400

What does it mean for elements to be isoelectronic? 

When they have the same number of electrons 

400
The mass number of Potassium.
What is 39.098?
400

The gold foil experiment discovered what? 

led to the discovery of the atomic nucleus

500

Calculate the energy of an electron that emits a photon with a frequency of 6x10^15 Hz?

3.98 x10^-18 Joules

500

Where is an electron located with these four quantum numbers? 4,2,-2, +1/2

the fourth energy level in the d subshell in the first orbital with a positive spin 

500

Which two elements have the same ground-state electron configuration?

NO TWO ELEMENTS have the same

500
Mass number - atomic number = ______ __ ________.
What is the numer of neutrons?
500

Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is _____ amu.

40X 13.01% 40.10

41X 6.98% 41.00

44X 79.99% 43.98

43.26 amu 

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