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Question
The similarities in the properties of a group of elements are because they have the same ______.
Options
electronic configuration
number of outer electrons
atomic numbers
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Solution
The similarities in the properties of a group of elements are because they have the same number of outer electrons.
RELATED QUESTIONS
Calcium is an element with atomic number 20. Stating reason, answer each of the following questions:-
(i) Is calcium a metal or a non-metal?
(ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19?
(iii) Write the formula of its oxide.
Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.
How does the electropositive character of elements change on going down in a group of the periodic table?
Given alongside is a part of the periodic table. As we move vertically downward from Li to fr?
| Li | Be |
| Na | |
| K | |
| Rb | |
| Cs | |
| Fr | |
| rA | Ra |
What happens to the size of atoms?
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
State the trends in physical properties on moving down the group. Give an example to illustrate.
Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.
Which is more electronegative than chlorine?
State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
Moving down in the second group, number of valence electrons ______.
