The similarity in chemical behavior of elements in the same group of the periodi

Question

The similarity in chemical behavior of elements in the same group of the periodic table is best explained by the fact that atoms of these elements have: the same number of neutrons in the nucleus; the same number of protons m similar nuclear composition; the same number of valence electrons none of these A metal M formed two different chlorides. MCl_2 and MCI_3. The metal could be Fe Ba; Al Na none of these An element has electronic configuration ls^22s^22p^63s^23p^64s2^. Which element is in the group? potassium nickel aluminum magnesium none of these A pure substance X is heated and changes into two new substances. V and From this information, we can deduce that X is a compound Y and Z are both elements Y and Z are both compounds X is an element and Y and Z are both compounds none of these Which set of quantum numbers is not allowed: n = 1, l = 0 ml = 0, s = + 1/2; n = 2, l = 1, ml=1.s = -1/2 n = 3,; = 3 m_l = -3, s = -1/2; n = 4, l = 0, ml = 0, s = + 1/2 all are correct What is the symbol for the ion that contains 22 protons, 20 electrons and 26 protons?^48 Ti^6+^48 Ti^2+^42 Fe^2+^48 Ca^2+ none of these The correct combination of coefficients when the following reaction is Fe_2O_3(s) + CO(g) rightarrow Fe(s) + CO_2(g) 1, 2,1,3 2,2,3,1 1,3,2,3 1, 2,4,5 Which series fits cobalt - 60? 27 protons, 27 neutrons, 27 electrons 33 protons, 27 neutrons, 33 electrons

Explanation / Answer

8. The similarity between chemical reactivity of elements in the same group is,

(d) the same number of valence electrons

9. A metal M forming MCl2 and MCl2 could be,

(a) Fe

10. Element that would be in the same group as the given electronic configuration is,

(d) magnesium

11. When X (pure compound) is heated we get Y and Z, we can say that,

(a) X is a pure substance

12. The set of quantum number not allowed would be,

(c)

13. The symbol for the ion would be,

(b) 48Ti2+

14. The correct combination of coefficient for the given balanced equation would be,

(c) 1,3,2,3

15. The series which fits Co-60 is,

b) 27 protons, 33 neutrons, 27 electrons

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