please help with some chem?
Which statement is true about the properties of the elements in any one period of the Periodic Table?
They are determined by the number of neutrons.
They are determined by the number of electrons in the first shell.
They change in a generally systematic manner.
They change in a random, unpredictable manner.
Which list of elements contains two metalloids?
Si, Ge, Zr, Pb
As, Bi, Br, Kr
Si, P, S, Cl
Zr, Sb, I, Xe
In which group of the Periodic Table do most of the elements exhibit both positive and negative oxidation states?
17
2
12
7
Which element has chemical properties that are most similar to the chemical properties of sodium?
Mg
K
Se
Cl
As the elements in Period 3 are considered from left to right, they tend to
lose electrons more readily and increase in metallic character
lose electrons more readily and increase in nonmetallic character
gain electrons more readily and increase in metallic character
gain electrons more readily
1) change in a generally systematic manner
2) 1
3) 17
4) K
5) gain electrons more readily
sodium lamp 250w syilvania and 150w GE (General Electric)
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