Question

Q1. Read the paragraph and answer the following questions. Trends in modern periodic table Valency: As you know, the valency of an element is determined by the number of valence electrons present in the outermost shell of its atom. Atomic Size: The term atomic size refers to the radius of an atom. The atomic size increases down the group. (a)How many periods and groups are present in the modern periodic table?

6,18

7,19

7,20

7,18​

Answer 1

ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴠᴀʟᴇɴᴄᴇ ᴇʟᴇᴄᴛʀᴏɴs ɪɴᴄʀᴇᴀsᴇs ғʀᴏᴍ 1 ᴛᴏ 8 ɪɴ ɢᴏɪɴɢ ғʀᴏᴍ ʟᴇғᴛ ᴛᴏ ʀɪɢʜᴛ ɪɴ ᴀ ᴘᴇʀɪᴏᴅ. ᴛʜᴜs, ᴛʜᴇ ᴠᴀʟᴇɴᴄʏ ɪɴᴄʀᴇᴀsᴇ ғɪʀsᴛ ғʀᴏᴍ 1 ᴛᴏ 4 ᴀɴᴅ ᴛʜᴇɴ ᴅᴇᴄʀᴇᴀsᴇs ғʀᴏᴍ 4 ᴛᴏ 0 ᴡʜɪʟᴇ ɢᴏɪɴɢ ғʀᴏᴍ ʟᴇғᴛ ᴛᴏ ʀɪɢʜᴛ ᴀʟᴏɴɢ ᴀ ᴘᴇʀɪᴏᴅ ɪɴ ᴛʜᴇ ᴍᴏᴅᴇʀɴ ᴘᴇʀɪᴏᴅɪᴄ ᴛᴀʙʟᴇ.

Answer 2

Answer:

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