Question

Why and how elements are arranged in a period

Answer 1

The periodic table brings order to information about the chemical elements. It helps chemists to understand why elements react as they do.

The chemical elements are arranged in order of increasing atomic number.

The horizontal rows are called periods and the vertical columns are called groups.

Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency.

Answer 2

Explanation:

how elements are arranged in a period?

Ans)A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.

why elements are arranged in a period?

Ans) elements in the same column have similar chemical and physical properties, reflecting the periodic law. For example, the alkali metals lie in the first column (group 1) and share similar properties, such as high reactivity and the tendency to lose one electron to arrive at a noble-gas electronic configuration.

Patterns along a period are :

1. electronegativity increasesincreases.
2. sheilding effect decreases.
3. atomic radius decreases.
4. electron gain enthalpy increases.
5. metallic character decreases.

ionisation enthalpy increases.

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