Periodic classification of elements Worksheet-6
A. Will change indefinitely
B. Increases at a constant rate
C. First increases then decrease
D. First decreases and then increases
A. (i) Increase continuously; (ii) Decreases continuously
B. (i) Decreases continuously; (ii) Increases continuously
C. (i) Increases continuously; (ii) Decreases up to the group IV and then increases upto the end of the period.
D. (i) Decreases continuously; (ii) Decreases upto the group IV and then increases upto the end of the period.
A. IIIA B. VA C. VIIA D. IIA
A. Number of electrons B. Number of protons
C. Number of neutrons D. Number of isotopes
E. Number of nucleons
A. Atomic size B. Density
C. Valence electrons D. Metallic character
A. Hg B. Li C. Ga D. Br
A. Al B. Si C. P D. Mg
A. Continuous increase
B. Continuous decrease
C. Periodic one, an increase followed by a decrease
D. A decrease followed by increase
A. It belongs to II group of the periodic table
B. It has 20 neutrons
C. The formula of its oxide is MO2
D. It belongs to 4th period of the periodic table
A. Decreases from left to right across a period and on descending a group
B. Decreases from left to right across a period and increases on descending a group
C. Increases from left to right across a period and on descending a group
D. Increases from left to right across a period and decreases on descending a group
A. Flourine > bromine > chlorine > iodine
B. Flourine > chlorine > bromine > iodine
C. Iodine > bromine > chlorine > fluorine
D. Bromine > chlorine > flourine > iodine
A. They are non-metals
B. They are electronegative
C. Their atoms are generally univalent
D. They have 7 electrons in the outermost shell of their atom
A. 8 electrons B. 6 electrons C. 4 electrons D. 2 electrons
A. Ne B. Ar C. Rn D. He
Explanation: First decreases to a minimum and then increases
Explanation: Atomic radius decreases from left to right in a
period and increases from top to bottom in a group.
Explanation: In IIA group all elements are metals while in IIIA, IVA and VIIA groups non-metallic elements are also present. Group II A elements are called alkaline earth metals.
Explanation: The atomic no. of an element is derived from the number of proton because during chemical reaction number of electrons undergo change.
Explanation: Valency of the elements in a group is same as the electronic configuration is same.
Explanation: Mg, as we move across the period atomic radius decreases.
Explanation: Continuous increase as no. of shells increases down the group.
Explanation: Its valency is 2. So it will form MO. (valency of oxygen is also 2)
Explanation: Fluorine is more reactive than chlorine, bromine and iodine.
Explanation: Electronic configuration of outermost shell of group-17 or halogens are ns2np5.
Explanation: Valence shell configuration for IIA group elements is : ns2
Explanation: He has the atomic number 2 so it does not have octet.