Based on silicon's position on the periodic table, it has a. 14 electrons, which include 4 valence electrons in the third energy level and 10 electrons distributed over the first two energy levels. b. 14 electrons, which include 2 valence electrons in the third energy level and 12 electrons distributed over the first two energy levels. c. 14 valence electrons distributed over three energy levels. d. 14 electrons, which include 10 valence electrons in the second energy level and 4 electrons in the first energy level.

A. 14 electrons, which include 4 valence electrons in the third energy level and 10 electrons distributed over the first two energy levels.

Explanation:

Silicon is an element with atomic number 14 and thus contain 14 electrons. It is a p block element as the last electron enters the p orbital. The nearest noble gas is neon with 10 electrons.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration in terms of noble gs configuration is:  

The valence electrons are the electrons present in last shell i.e n= 3, thus there are 4 valence electrons, 8 electrons in n= 2 and 2 electrons in  n= 1 energy level. Thus total of 10 electrons in first two energy levels.

 169ml

Explanation

At constant temperature, PV is constant

Standard pressure is 101 kpa

150ml X 114kpa=?mlX101 kpa

?=114/101 X150 = 169 ml