Variation of Atomic Size
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How to calculate the number of electrons?
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is :
(a) Mg (b) Na (c) K (d) Ca
On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
(a) increases (b) decreases
(c) remains the same (c) first increases then decreases
Arrange the following in order of increasing radii :
(a) Cl−, Cl (b) Mg2+, Mg, Mg+ (c) N, O, P
Atomic size
On moving from left to right across a period, the atomic size ______.
Increases
Decreases
Remains constant
No trend observed
Which of the following substances has the least ionic character?
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic? Ga Ge As Se Be
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is :
(a) O, F, N (b) N, F, O (c) O, N, F (d) F, O, N
Which among the following elements has the largest atomic radii?
(a) Na
(b) Mg
(c) K
(d) Ca
(1) The properties of the elements are a periodic function of their _________ (atomic number, mass number, relative atomic mass).
(2) Moving across a ________ of the periodic table, the elements show increasing _______ character (group, period, metallic, non-metallic).
(3) The element at the bottom of a group would be expected to show ________ metallic character than the element at the top (less, more).
(4) The similarities in the properties of elements belonging to a group is because they have the same _________ (electronic configurations, number of outer electrons, atomic number).
Which of the following gives the correct increasing order of the atomic radii of O, F and N?
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
How many electrons do the following elements have in their outermost shells?
4
7
1
2
The force of attraction between cation and anion of an ionic compound is _______
electrostatic force of attraction
metallic bond
hydrogen bond
none of these
Which of the following properties generally increases on moving from top to bottom in a group?
Ionisation energy
Valency
Atomic size
Non-metallic character
Maximum number of elements in a particular period depends upon :
a)how electrons are filled into various shells
b)the formula of 2n
Mg or Mg^2+
Cl or Cl^-
The amount of energy released when a neutral gaseous atom gains one electron is called
(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?
(b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?
The correct order of ionic radii of the species N3−, O2−, Na+ and F− is:
< < <
< < <
< < <
< < <
What is the meaning of Valency of group remain same as number of electrons in the outermost shell remains same
- In any group, the atomic radius increases while going down the group.
- In any period, the electronegativity of an atom increases from left to right.
- In any group, the metallic character of elements increases while going down the group.
- In any period, the atomic radius increases from left to right.
Which of the following elements would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca
Why S block Elements are Soft Metals?
The most distinctive property of noble gas is that they are:
Unreactive
Radioactive
Metalloid
Metallic
(ii) Name the elements in period 1.
(iii) What happens to the atomic size of elements on moving from left to right in a period?