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प्रश्न
Name the non-metals in the first twenty elements.
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उत्तर
C, N, O, F, Ne, P, S, Cl, Ar, H and He.
संबंधित प्रश्न
What is meant by a group, in a periodic table?
What is meant by a period, in a periodic table?
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
Name the noble gas with 3 shells.
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Give the symbol and valency of the following element and radical.
Nitrate
Group 1 and 2 : s block : : group 13 and 18 : _______
Noble gases are placed in the ______ group in the modern periodic table.
