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the vertical coloumn of the periodic table is called..
a group
a horizontal row in a periodic table is called...
a period
elements in the same group tend to have similar..
properties
periods tell us how many..
shells an element has
groups tell us how many..
electrons on the outer shell
what group is calcium in
2
what group and period is oxygen in
group 6, period 2
What are 2 properties of metals?
Good conductor for electricity/thermal energy, high density, malleable, high melting points
What group of elements are the least reactive?
Noble gases
is the number of protons in the nucleus
atomic number
the number of protons + neutrons in the atom
mass number
..................discovered that the nucleus of the atom contains positively charged protons.
Rutherford
What are the characteristics of nonmetals?
dull, poor conductors of electricity
What is the family group # and period for this element?
group 5. period 2
What color is the blue section of the periodic table.
The Metals
Valence Electrons determie the __________________ .
Chemical Properties or Reactivity of the atom.
