click below
click below
Normal Size Small Size show me how
Periodic Table
Question | Answer |
---|---|
group 1 | alkali metals |
group 17 | halogens |
group 18 | noble gases |
periodic table of elements | a system to organize elements into categories |
each element is represented by.. | by a symbol consisting of one or two letters |
atomic number | number of protons |
number of protons is equal to | number of electrons |
the atomic number is found at | the top of an element |
a period on the periodic table | a row of elements across |
the sith period begins with... and ends with... | cesium, radon |
as you move right on the periodic table | the atomic number increases one by one |
group or family | elements in the same column |
periodic table is arranged by | properties of an atom, mostly by electrons |
a period ends | when the number of valance elctrons reaches eight |
all elements in each group | has the same number of valance electrons |
electrons that have the highest energy level and are help most loosely | a valance electron |
how many valance electrons does Hydrogen have? | 1 |
how many valance electrons does Carbon have? | 4 |
how many valance electrons does Oxegen have? | 6 |