Chemistry Periodic Table Exercise5c
Please Select
Q1 Element P has atomic number 19. To which group and period. does P belong? It is a metal or a non- metal? Why?
Q2 An element belongs to the –rd period and Group III A(13) of the periodic table. State
(a) the number of valence electrons.
(b) the valency,
(c) if it is a metal or non-metal
(d) the name of the element.
Q3 Name or state the following with reference to the element of the first three periods of the periodic table.
(a) Noble gas with duplet arrangement of electrons.
(b) Metalloid in Period 3.
(c) Valency of elements in Group 14 and 15.
(d) Noble has having electronic configuration 2, 8, 8.
(e) Group whose elements have zero valency.
(f) A covalent compound formed by an element in p 2 and a halogen.
(g) Non-metallic element present in Period 3 of Groups 15 and 16.
(h) An electrovalent compound formed by an alkaline earth metal and a halogen.
(i) Bridge elements of Period 3 of Group 1, 2 and 3,
(j) Alkali metal in Period 3 that dissolves in the water giving a strong alkali.
(k) Typical elements of Groups 14 and 15.
(l) Alkaline earth metal in Period 3.
Q4 Match the Column A with Column B
Q5 Complete the table
Q6 Write down the word that will correctly complete the following sentences:
a) The relative atomic mass of a light element up to calcium is approximately ……….. its atomic number.
b) The horizontal row quess in a periodic table are called ………
c) Going across a period left to right, atomic size………..
d) Moving left to right in the second period, the number of valence electrons…….
e) Moving down in the second group, the number of valence electrons …………
Q7 (a) Name the alkali metals. How many electrons (s) do they have in their outermost orbit.
(b) Take any one alkali metal and write its reaction with i) Oxygen ii) Water iii) Acid
Q8 a) Name the method by which alkali metals can be extracted.
b) What is the colour of the flame of Sodium and Potassium?
Q9 An element A has 2 electrons in its, fourth shell. State
a) its atomic number
b) its electronic configuration
c) its valency
d) position in the periodic table
e) is it a metal or a non-metal
f) is it an oxidizing or reducing agent?
Q10 (a) Name the first three alkaline earth metals.
(b) Write their reactions with dil hydrochloric acid.
Q11 (a) How do alkaline earth metals occur in nature?
(b) Write the electronic configuration of the first two alkaline earth metals.
Q12 Give reasons.
(a) Alkali metals are kept in an inert solvent.
(b) Alkali metals and halogens do not occur free in nature.
(c) Alkali and alkaline earth metal compounds usually form electrovalent compounds.
(d) Inert gases do not form compounds
Q13 Arrange the following
(a) Elements of group 1, in increasing order of reactivity.
(b) Elements of group 17, in decreasing order of reactivity.
(c) He, Na, Mg (increasing order of melting point).
(d) Chlorine, sodium, magnesium (increasing reducing character).
Q14 (a) State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.
(b) Why group 17 elements are highly reactive?
Q15 (a) How many electrons do inert gases have in their valence shells?
(b) Name an element of group 18 which can form compounds.
Q16 Name the gas used in
(a) filling balloons
(b) light bulbs
(c) bright coloured advertising light works
Q17 (a) What is the name given to group 17 elements? Why are they called so?
(b) Comment on the (i) reactivity (ii) colour and (iii) physical state of group 17 elements.
Q18 Two elements P’ and 'Q’ belong to the same period of the modern periodic table and are in group 1 and group 2 respectively. Compare the following characteristics in tabular form.
(a) the number of electrons in their atoms.
(b) their tendency to lose electrons.
(c) their metallic characters.
(d) formation of their oxides.
(e) formulae of their chlorides.
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