1. What do you understand by atomic size ? State its unit.
2. Give the trends in atomic size on moving :
(i) down the group,
(ii) across the period left to right.
3. Arrange the elements of second and third period in increasing order of their atomic size (excluding noble gases).
4. Why is the size of (i) neon greater than fluorine? (ii) sodium is greater than magnesium ?
5. (i) Which is greater in size ?
(a) an atom or a cation
(b) an atom or an anion
(c) Fe2+ or Fe3+
(ii) Which has higher E.A., Fluorine or Neon.
(iii) Which has maximum metallic character Na, Li or K.
6. Arrange :
(i) Be,Li,C,B,N,O,F (in increasing metallic character).
(ii) Si,Na,Al,Mg,Cl,P,S (in decreasing non-metallic character).
7. State the trend in chemical reactivity :
(i) across the third period left to right,
(ii) down the group.
a. in group IA (1)
b. in group VIIA (17)
8. A metal M forms an oxide having the formula M2O3. It belongs to third period. Write the atomic number and valency of the metal.
9. An element X belongs to 3rd period and 17th group, state
(i) no. of valence electrons in it.
(ii) name of the element

Question

1. What do you understand by atomic size ? State its unit.
2. Give the trends in atomic size on moving :
(i) down the group,
(ii) across the period left to right.
3. Arrange the elements of second and third period in increasing order of their atomic size (excluding noble gases).
4. Why is the size of (i) neon greater than fluorine? (ii) sodium is greater than magnesium ?
5. (i) Which is greater in size ?
(a) an atom or a cation
(b) an atom or an anion
(c) Fe2+ or Fe3+
(ii) Which has higher E.A., Fluorine or Neon.
(iii) Which has maximum metallic character Na, Li or K.
6. Arrange :
(i) Be,Li,C,B,N,O,F (in increasing metallic character).
(ii) Si,Na,Al,Mg,Cl,P,S (in decreasing non-metallic character).
7. State the trend in chemical reactivity :
(i) across the third period left to right,
(ii) down the group.
a. in group IA (1)
b. in group VIIA (17)
8. A metal M forms an oxide having the formula M2​O3​. It belongs to third period. Write the atomic number and valency of the metal.
9. An element X belongs to 3rd  period and 17th  group, state
(i) no. of valence electrons in it.
(ii) name of the element

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Question Text	1. What do you understand by atomic size ? State its unit. 2. Give the trends in atomic size on moving : (i) down the group, (ii) across the period left to right. 3. Arrange the elements of second and third period in increasing order of their atomic size (excluding noble gases). 4. Why is the size of (i) neon greater than fluorine? (ii) sodium is greater than magnesium ? 5. (i) Which is greater in size ? (a) an atom or a cation (b) an atom or an anion (c) $Fe^{2 +}$ or $Fe^{3 +}$ (ii) Which has higher E.A., Fluorine or Neon. (iii) Which has maximum metallic character $Na$ , $Li$ or $K$ . 6. Arrange : (i) $Be, Li, C, B, N, O, F$ (in increasing metallic character). (ii) $Si, Na, Al, Mg, Cl, P, S$ (in decreasing non-metallic character). 7. State the trend in chemical reactivity : (i) across the third period left to right, (ii) down the group. a. in group IA (1) b. in group VIIA (17) 8. A metal $M$ forms an oxide having the formula $M_{2} O_{3}$ . It belongs to third period. Write the atomic number and valency of the metal. 9. An element $X$ belongs to $3^{rd}$ period and $1 7^{th}$ group, state (i) no. of valence electrons in it. (ii) name of the element
Topic	Chemistry
Subject	Science
Class	Class 9

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