Periodic Table
What number tells you the number of protons and also tells you the number of electrons?
Atomic Number
What is the center of the atom called?
Nucleus
What is the name of the element with 79 protons?
Gold
How many elements have 3 energy levels?
8
How many electrons fit on the first energy level?
2
How do you figure out how many neutrons an element has in one of its atoms?
Subtract the atomic number from the atomic mass.
What particle has a positive charge?
Proton
What element has an atomic mass of 238.
U, Uranium
What element has 17 electrons?
Chlorine
How many electrons fit on the second energy level?
8
What parts of an atom are added together to get the atomic mass?
protons and neutrons (in the nucleus)
What particle has no charge?
Neutron
How many neutrons does an atom of magnesium (Mg) have?
12 neutrons
What element has 2 energy levels and 7 valence electrons?
Fluorine (F)
Figure out the number of electrons on each energy level for NEON
2) 8)
What subatomic particle can be counted to identify the element?
What particle has a negative charge?
Electron
Which element has an atomic number of 20?
Ca, Calcium
How many neutrons are in one atom of Lithium?
4 neutrons
Figure out the number of electrons for each level for Sulfur.
2) 8) 6)
What is a valence electron and why are they important?
They are the electrons in the outermost energy level and they are responsible for bonding (or reactivity)
What is the mass of a proton?
1 AMU (Atomic Mass Unit)
Name the element with 2 electrons in the 1st energy level and 8 electrons in the 2nd energy level.
Neon
What element has 1 proton, 1 electron, and no neutrons?
Hydrogen
Explain the octet rule.
Atoms attempt to empty or fill their outermost level by sharing, stealing, or giving up electrons.