Question

an element x has 19 electrons the possible valency of an element x is
options a)1 (b)2 (c)3 (d) 4

Answer 1

Answer:

1

Explanation:

element containing 19 electron is potassium and in electronic configuration in its outermost shell there is only one electron. thus it's valency is 1

Answer 2

Answer:

Solution

(a) The element with atomic number 19 is potassium (K). Its electronic configuration is 2, 8, 8, 1.

(i) Element is monovalent (ii) Element is a metal.

(b) Formula of the oxide of the element : K2O" role="presentation" style="display: inline; font-style: normal; font-weight: normal; line-height: normal; font-size: 13px; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">K2OK2O

(c) The element K (Z = 19) is more reactive than the element Na (Z = 11). Actually, K is placed below Na in group 1 (Alkali metals) and the reactivity increases down a group. For example, both Na and K catch fire in water but K burns more violently than Na

Explanation:

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