5. The table below shows the elements in the third period of the Periodic Table, the number of electrons in their outer energy level, their oxidation state in their common compounds and their melting points. element Na Mg Al Si CI Ar number of outer electrons 1 3 oxidation state +1 +2 +3 +4/-4 -3 -2 -1 01 melting point/C 98 650 660 1414 317 115 -101 -189 Describe why sillicon have significantly high melting point The no of outer electron will affect the effective nuclear charge. Explain how effective nuclear charge can cause the decreasing the atomic size Explain why Na, Mg and Al are good conductors of electricity. Which element exists as diatomic molecules of the type X2? l) ilI) Iv) 7, P. 4.

Question
5. The table below shows the elements in the third period of the Periodic Table, the
number of electrons in their outer energy level, their oxidation state in their
common compounds and their melting points.
element
Na
Mg
Al
Si
CI
Ar
number of outer electrons
1
3
oxidation state
+1
+2
+3
+4/-4
-3
-2
-1
01
melting point/C
98
650
660
1414
317
115
-101
-189
Describe why sillicon have significantly high melting point
The no of outer electron will affect the effective nuclear charge. Explain
how effective nuclear charge can cause the decreasing the atomic size
Explain why Na, Mg and Al are good conductors of electricity.
Which element exists as diatomic molecules of the type X2?
l)
ilI)
Iv)
7,
P.
4.
Expand
Transcribed Image Text

5. The table below shows the elements in the third period of the Periodic Table, the number of electrons in their outer energy level, their oxidation state in their common compounds and their melting points. element Na Mg Al Si CI Ar number of outer electrons 1 3 oxidation state +1 +2 +3 +4/-4 -3 -2 -1 01 melting point/C 98 650 660 1414 317 115 -101 -189 Describe why sillicon have significantly high melting point The no of outer electron will affect the effective nuclear charge. Explain how effective nuclear charge can cause the decreasing the atomic size Explain why Na, Mg and Al are good conductors of electricity. Which element exists as diatomic molecules of the type X2? l) ilI) Iv) 7, P. 4.

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