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Who proposed that electrons are only found in specific, discrete circular orbits around the nucleus?

• Albert Einstein

• Erwin Schrodinger

• Ernest Rutherford

• Niels Bohr

Who is the Greek philosopher that developed the idea about atoms in 500 BC?

• Dalton

• Plato

• Aristotle

• Democritus

What model of the atom replaced Bohr's model?

• Heisenberg's model

• Thomson's model

• Rutherford's model

• Quantum Mechanical model

Regions in which electrons are likely to be found is called

• atomic orbitals

• principal energy level

• energy sublevel

• spin

How many energy levels are currently present on the periodic table?

• 18

• 7

• 6

• 4

How many electrons can be held in the first energy level?

• 2

• 8

• 6

• 10

How many orbitals are there in a p-sublevel?

• 1

• 3

• 5

• 7

What sublevels are present in the 5th energy level of an atom?

• s

• p and d

• d and f

• s p and d

• s p d and f

Magnesium is placed in the ____ energy level on the periodic table.

• 1st

• 5th

• 3rd

• 24th

• 12th

How many electrons can fit in a p atomic orbital?

• 6

• 2

• 10

• 5