Atomic Theory and Electron Arrangement in Atoms

The nucleus of an atom in composed of:

• electrons and protons

• electrons and neutrons

• protons

• protons and neutrons

True or False? Atoms of the same element have identical numbers of protons

• TRUE

• FALSE

Mass number:

• the average isotope mass for an element

• the mass an electron

• the total number of protons and neutrons in the nucleus

• number of electrons and protons in an atom

d orbitals

• start at n=3

• 5 different shapes

• hold 10 electrons total

• all of the above

The maximum number of electrons that can fit on the 4th energy level is:

• 8

• 18

• 32

• 4

An atom of ¹⁰B (element number 5) has:

• 5 protons, 5 electrons and 5 neutrons

• 5 protons, 5 electrons and 10 neutrons

• 10 protons, 5 electrons and 5 neutrons

• 10 protons, 10 electrons and 5 neutrons

The number of electrons for the following would be:

• 12

• 24

• 14

• 10

What orbitals are on the third energy level?

• 3s only

• 3s and 3p only

• 3s 3p and 3d

• 3s 3p 3d and 3f

What type of orbital is this and how many electrons can it hold?

• d orbital, 10

• f orbital, 14

• d orbital, 5

• f orbital, 10

The element with the electron configuration ending 3p³ is:

• nitrogen

• arsenic

• phosphorus

• sodium