Question

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Answer 1

Answer:

The number of shells in the electronic configuration of the given element determine it's period i.e. if there are 3 shells in an atom then it will belong to period 3.

The number of valence electrons in the atom determines the group number of that atom i.e. if an element has 4 valence electrons then it must belong to group IV A.

Let us take an example:

Element: Sodium

Symbol: Na

Electronic Configuration: 2, 8, 1

Since sodium has 3 shells, it belongs to period 3. Also, we notice that this element has 1 electron in its outermost orbit therefore it belongs to group I A.

Hence, Sodium is present in group IA of period 3 in the modern periodic table

Answer 2

Answer:

Carbon

oxygen

nitrogen

carbon

noble gases

Explanation:

• Silicon (Si), a nonmetallic chemical element in the carbon family (Group 14 [IVa] of the periodic table).
• Sulfur (S), also spelled sulphur, nonmetallic chemical element belonging to the oxygen group (Group 16 [VIa] of the periodic table), one of the most reactive of the elements.
• Antimony (Sb), a metallic element belonging to the nitrogen group (Group 15 [Va] of the periodic table).
• Tin (Sn), a chemical element belonging to the carbon family, Group 14 (IVa) of the periodic table. It is a soft, silvery white metal with a bluish tinge, known to the ancients in bronze, an alloy with copper.
• Xenon (Xe), chemical element, a heavy and extremely rare gas of Group 18 (noble gases) of the periodic table. It was the first noble gas found to form true chemical compounds.

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