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प्रश्न
Name or state following with reference to the element of the first three periods of the periodic table.
The formula of the hydroxide of the element having electronic configuration 2, 8, 2.
उत्तर
Hydroxide of element [2, 8, 2] is Mg [OH], where Mg is the element.
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संबंधित प्रश्न
The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table. Answer the following questions, giving justification in each case:-
(i) Write the group to which these elements belong.
(ii) Name the least reactive element.
(iii) Name the element having largest atomic radius.
Match the atomic number 2, 4, 8, 15 and 19 with each of the following
1) A solid non metal belonging to the third period.
2) A metal of valency 1.
3) A gaseous element with valency 2.
4) An element belonging to Group 2
5) A rare gas.
Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table?
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
Which of the following element does not lose an electron easily?
(a) Na
(b) F
(c) Mg
(d) Al
An element A has atomic number 14. To which period does this element belong and how many elements are there in this period.
K, Pb, Ca, Zn (In the increasing order of the reactivity)
Arrange the following in order of increasing radii:
Mg2+, Mg, Mg+
Fill in the blank and rewrite the completed statement:
________ group in the periodic table contains elements that are all gases at room temperature.
Select the correct answer from the options given below.
Is the group number of the element whose atomic number is 4.
