Question

The modarn periodic table in short most imp question.​

Answer 1

Explanation:

The modern periodic table is used to organize all the known elements. Elements are arranged in the table by increasing atomic number. In the modern periodic table, each element is represented by its chemical symbol. The number above each symbol is its atomic number.

Answer 2

Answer:

Question.1The elements of the second period of the Periodic Table are given below:

Li Be B C N O F

(a) Give reason to explain why atomic radii decrease from Li to F.

(b) Identify the most

(i) metallic and

(ii)non-metallic element.

Explanation:

Question.2 The elements of the third period of the Periodic Table are given below:

periodic-classification-of-elements-chapter-wise-important-questions-class-10-science-1

(a) Which atom is bigger, Na or Mg? Why?

(6) Identify the most (i) metallic and (ii) non-metallic element in Period 3.

Question.3 The position of three elements A, B and C in the Periodic Table is shown below:

periodic-classification-of-elements-chapter-wise-important-questions-class-10-science-2

Giving reasons, explain the following:

(a) Element A is a non-metal.

(b) Element B has a larger atomic size than element C.

(c) Element C has a valency of 1

Giving reasons, explain the following:

(a) Element A is non-metal.

(b) Atom of element C has a larger size ‘ than atom of element A.

(c) Element B has a valency of 1.

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