Q15 of 52 Page 38

Which of the following elements does not lose an electron easily?

Flourine has 7 electrons in the outermost orbit. Its atom size is smallest too. Since it is the most electronegative element, thus does not lose an electron easily.
Sodium has one valence electron, Magnesium has 2 valence electrons, and Aluminum has 3 valence electrons. These are all metals that lose electrons easily.

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13

Which among the following elements has the largest atomic radii?

 14

Which of the following elements would lose an electron easily?

 16

Which of the following are the characteristics of isotopes of an element?

(i) Isotopes of an element have same atomic masses.


(ii) Isotopes of an element have same atomic number.


(iii) Isotopes of an element show same physical properties.


(iv) Isotopes of an element show same chemical properties.

 17

Arrange the following elements in the order of their decreasing metallic character: Na, Si, Cl, Mg, Al