This or That
Electrons found in the outermost shell of an atom.
What are valence electrons?
Objects with the same charge do this when they come close to each other
What is repel?
These are the subatomic particles.
What are protons, neutrons, and electrons?
The number of protons in an atom of a certain element
What is atomic number?
This CANNOT be known about electrons.
exact location
The SI base unit used to measure the amount of a substance, measured in grams
What is a mole?
Objects with different charges do this when they come close to each other.
What is attract?
Located outside the nucleus and have a negative charge.
What are electrons?
The sum of protons and neutrons in the nucleus of an atom
What is mass number?
Electrons move from one of these to another by gaining or losing energy
What are energy levels?
What is an atomic mass unit (u)?
The charge of an unreacted atom.
What is neutral or no charge?
Located in the nucleus and have no electric charge.
What are neutrons?
The atomic number of Oxygen.
What is 8?
These are given off when electrons move from an excited state to a lower state.
What are photons?
The number of moles of Hydrogen atoms in 2.0 grams of Hydrogen
What is 2.0?
The overall charge of a nucleus
What is positive?
Atoms of different elements always have different numbers of these.
What are protons?
The mass number of Potassium-40
What is 40?
The region of space around the nucleus where an electron is likely to be found
What is an orbital?
The molar mass of Nitrogen atoms, with proper units.
What is 14.007 g?
The mathematical formula for the number of electrons an energy level, n, can hold?
What is 2n2?
An atom having the same atomic number but a different atomic mass as other atoms of that element.
What is an isotope?
The number of neutrons in Potassium-40
What is 21?
These are determined by the valence electrons.
What are chemical properties?