Chemistry
Match the elements in column 'X' with the correct group they belong from column 'Y'
| X | Y |
|---|---|
| 1: Element with atomic number 19 | A: Group 18 [0 group] |
| 2: Element with electronic configuration 2 | B: Group 16 [VI A] |
| 3: Element with a valency of -2 | C: Group 1 [IA] |
| 4: Element 'P' which loses 3 electrons to form a cation | D: Group 17 [VII A] |
| 5: Element 'Q' in period-3 which has the highest electron affinity | E: Group 13 [III A] |
Periodic Table
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Answer
| X | Y |
|---|---|
| 1: Element with atomic number 19 | A: Group 1 [IA] |
| 2: Element with electronic configuration 2 | B: Group 18 [0 group] |
| 3: Element with a valency of -2 | C: Group 16 [VI A] |
| 4: Element 'P' which loses 3 electrons to form a cation | E: Group 13 [III A] |
| 5: Element 'Q' in period-3 which has the highest electron affinity | D: Group 17 [VII A] |
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With reference to period 3 of the periodic table — State :
- The type of bonding of the element with electronic configuration 2, 8, 7.
- The formula of the chloride of the element with electronic configuration 2, 8, 4.
- The nature of the oxide of the alkaline earth metal in the period.
- The number of electrons in the penultimate shell of the element with valency -1.
- The electronic configuration of the element whose hydroxide is a weak base.
With reference to group 1 [IA] of the periodic table – fill in the blanks with the correct word:
The elements are …………… [light/heavy] …………… [metals/non metals] since their atomic size is …………… [large/small]. The energy binding the atoms is …………… [high/low] and hence the elements have …………… [high/low] melting points. The melting points of the elements …………… [increases/decreases] down the subgroup. The electropositive character …………… [increases/decreases] down the subgroup and the elements are strong …………… [reducing/oxidizing] agents. The element with electronic configuration 2, 8, 1 will have …………… [higher/lower] electron affinity and …………… [smaller/larger] atomic size than the element with electronic configuration 2, 1.
Give reasons for the following:
Occurrence of characteristic properties of elements takes place at definite intervals in the modern periodic table.
Give reasons for the following:
Properties of elements are periodic functions of their atomic numbers and not atomic weights.