Question

justify the position of hydrogen at the top of group IV-A and VII-A group in the periodic table with similarity and difference​

Answer 1

Answer:

===Similarities with group Vll-A:

Noble Gas Configuration: Hydrogen can gain one electron to complete its valence shells. Halogens also have seven electrons in their last shell and can gain one electron to gain noble gas configuration.

Electronegativity: They also share the same electronegative nature. Hydrogen also gains one electron (not looses) to become stable and so do halogens.

H + e‾ → H‾

Cl + e‾ → Cl‾

Diatomic Molecules: Both hydrogen and halogens form diatomic molecules. Hydrogen forms H2 and, halogens are Cl2, F2 etc

Reaction with Metals: Hydrogen combines with metals to form metallic hydrides. Similarly, halogens also combine with metals to form metal halides.

2Na + H2 → 2NaH

Ca + H2 → CaH2

Covalent Bonding: Halogens and hydrogen both also combine with non-metals to form molecules with covalent bonding.

===Dissimilarities with group Vll-A:

Structure of Atom: Hydrogen has only one electron in its outer shell. All halogens have seven electrons in their last shell

Size of Atom: The size of the H- ion is much larger than those of the ions of Halogens. This is because hydrogen has only one electron and proton and the pull of the nucleus is less.

Reaction with Water: Also unlike halogens, the hydrogen ion H- is unstable in water.

===Similarities with group lVA:

Valence shell of hydrogen is half filled like group IV-A elements.

Both hydrogen & Group IV members combine with other elements through covalent bonds.

Like carbon, hydrogen has strong reducing properties.

Hydrogen has just one electron in its outermost shell while group IV-A elements have four electrons.

===Differences with group lVA:

1. Hydrogen has just one electron in its outermost shell while group IV-A elements have four electrons.

2. Hydrogen is a gas while members of group IV are solid

3. Hydrogen exist in diatomic form while members of group IV do not exist in diatomic form.

4. Group IV A elements e.g. C and Si has property of catenation i.e. form long chain compounds while hydrogen do not form such compounds.

5. Group IV A elements e.g C can combine with more than one elements at a time. But hydrogen due to just one electron combine with only one element at a time.

Explanation:

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Answer 2

Answer:

Abu

This is your new I'd

Explanation:

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