Atomic Structure
What is the charge of a proton?
positive
What subatomic particle changes number in isotopes?
neutrons
What do Lewis Dot Diagrams show?
number of valence electrons
What information about an atom does its period (row) tell you?
Number of energy levels
What is the smallest subatomic particle?
Electron
What two particles are located in the nucleus of an atom?
protons and neutrons
What is an ion?
an atom or molecule with a net charge
How many energy levels would you draw on a Bohr model of Argon?
3
How many valence electrons do elements in group 14 have?
4
The majority of elements on the periodic table are classified as this:
Metals
How many electrons can the third energy level hold?
18
How many neutrons are in Carbon-14?
8
Draw a Lewis Dot Diagram of Helium.
He:
What two things do elements in the same group have in common?
number of valence electrons AND similar properties
Why is the atomic mass of an element not a whole number?
Average mass of all isotopes
What happens to the size of atomic radius as you move down a group in the periodic table?
Radius increases
What is the charge on an atom that has lost two electrons?
Draw a Bohr model of sodium.
11 p, 12 n, 11 e (2, 8, 1)
What order are the elements listed on the periodic table?
What is the most reactive group of metals?
Alkali metals
How many valence electrons does Carbon have?
4
How many electrons does Li1+ have?
2
How many energy levels would you draw on a Bohr model of Na1+?
2
Who created the periodic table and predicted the existence of unknown elements?
Mendeleev
What element has the smallest atomic radius?
Helium