Classifying Matter
Is Water (H2O) an element or compound?
Compound
What family(group) is Sodium (Na) in?
1
What makes an atom charged?
When it gains or loses electrons.
What decides the amount of dots that go around the element?
The amount of valence electrons
Which is more reactive? Alkali Metals or Alkali Earth Metals
Alkali Metals
Is Magnesium (Mg) an element or compound?
Element
What two elements are in period 1?
Hydrogen and Helium
To become stable should Fluorine gain or lose electrons (7 valence electrons)?
Easier to gain 1 than lose 7.
how many dots does Helium have?
1
What is the least reactive Alkali Metal?
Lithium(Li)
Is baking soda (NaHCO3) a pure substance or mixture?
Pure substance
What group is the Noble Gases in?
group 18
Should Magnesium gain or lose electrons to become stable, how many?
lose 2
How many valence electrons would Neon have?
8
When does the proton number equal the electron number?
When the atom is neutral
Is soil a Homogenous or Heterogenous mixture?
Heterogenous
What family(group) and period is Oxygen(O) in?
period 2 group 16.
If Sodium(Na) has 11 protons, 11 electrons and 12 neutrons is it charged/stable?
No
What would the Lewis dot diagram look like for Boron(B)?
B with 1 at the top 1 on the right and 1 on the bottom.
True or False?
Transition Metals have low melting points
False
Is Brass a Pure substance or Mixture?
Mixture
What group(family) and periods are the Halogens in?
group 17 periods 2-6
Lithium has 3 protons 3 electrons and 4 neutrons. What's its charge when stable?
it has a +1 charge
What's an element with 7 valence electrons?
Fluorine, Chlorine, Bromine, Iodine, Astatine.
What are the most stable elements?
Noble Gases