SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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18, 7
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7, 18
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Either A or B
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None of the above
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Detailed explanation-1: -In the modern periodic table, there are 18 groups and 7 periods .
Detailed explanation-2: -The given statement is absolutely correct. there are 7 periods and 18 groups in the modern periodic table.
Detailed explanation-3: -In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the 14 f-block columns, between groups 2 and 3, are not numbered.
Detailed explanation-4: -The modern periodic table is the present form of the periodic table in which the arrangement of elements is in the increasing order of their atomic numbers. There are 18 vertical columns or groups and 7 horizontal rows or periods in the modern periodic table.
Detailed explanation-5: -Group 1: The Alkali Metals. Group 2: The Alkaline Earth Metals. Group 17: The Halogens. Group 18: The Noble Gases. 05-Jun-2019