Classify the elements! urgent

2010-10-20 5:11 am
Element(not the periodic table symble)Melting point/℃Boiling point/℃Electrical conductivityM-101-35Non-conductorN-39357Good conductorO-758Non-conductorP113445Non-conductorQ2322687Good conductorR8501480Good conductorS9402800Semi-conductor
1) Classify the elements into gas, liquid and solid.

2) Classify the elements into metals, non-metals and semi-metals.

3) Name elements N and O. Find 2 more physical properties of them from Wikipedia.

回答 (1)

2010-10-20 9:24 am
✔ 最佳答案
1.
gas: both melting point and boiling point are lower than room temp.
solid: both melting point and boiling point are above room temp.
liquid: neither solid nor liquid.

gas: M
solid: P, Q, R, S
liquid: N, O

2.
metals are good electrical conductors
non-metals are typically non-conductors.
semi-metals are semi-conductors.

metals: N, Q, R
non-metals: M, O, P
semi-metals: S

3.
N is liquid metallic element, which is mercury.
density of mercury is 13.5 g/ml; silvery white in color.
O is liquid non-metallic element, which is bromine.
density of bromine is 3.1 g/ml; it's reddish-brown; has fouling smell.


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