Question

41. In a sample of ethyl ethanoate (CH,COOC2H5), the two oxygen atoms have the same number of electrons
but different number of neutrons. Which of the following is the correct reason for it?
(a) one of the oxygen atoms has gained electrons (b) one of the oxygen atoms has gained protons
(c) the two oxygen atoms are isotopes
(d) the two oxygen atoms are isobars
42. Which of the following elements does not exhibit electrovalency?
(a) calcium
(b) chromium
(c) carbon
(d) cadmium
43. The number of valence electrons in a graphite atom is:
(a) 2
(6) 4
(c) 3
(d) 5
44. The atomic numbers of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which
cannot form a cation is :​

Answer 1

Answer:

43)4

Explanation:

in the last shell has 4 electrons