Chemistry
This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Which of these :
(a) is the most electronegative element ?
(b) is a halogen ?
(c) is an alkali metal ?
(d) is an element with valency 4 ?
(e) have least Ionisation Energy.
(f) have least atomic size in period 3.
Related Questions
Explain the following:
Size of atoms progressively becomes smaller when we move from Sodium (Na) to Chlorine (Cl) in the third period of the Periodic Table.
Name the periodic property which relates to the:
(a) amount of energy required to remove an electron from an isolated gaseous atom,
(b) character of element which loses one or more electrons when supplied with energy,
(c) tendency of an atom in a molecule to attract the shared pair of electrons.
A group of elements in the Periodic Table are given below (boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following questions in relation to the above group of elements :
(a) Which element has the most metallic character ?
(b) Which element would be expected to have the highest electronegativity ?
(c) If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium ?
(d) The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
(e) Will the elements in the group to the right of this boron group be more metallic or less metallic in character ? Justify your answer.
In the periodic table, alkali metals are placed in the group:
- 1
- 11
- 17
- 18