Question

please solve this question​

Answer 1

Answer:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water – hence the name photosynthesis, from the Greek phōs , "light", and sunthesis "putting together".

Answer 2

(i) Isobars are atoms of two different elements having the same mass number but different atomic number.

First, let's complete the incomplete values.

For element X,  atomic number= mass number - number of neutrons

atomic number ( A) = 23-12 => 11

For element Y, mass number= atomic number + number of neutrons

mass number (B) = 20 + 20 => 40

So, the pair of isobars is Y and Z, both have the same mass number of 40 but different atomic numbers.

(ii) For Y, the atomic number is 20.

So, using the {2,8,8,2} electronic configuration rule for the first 20 elements we get its electronic configuration as {2,8,8,2}.

So, in the M shell, 8 electrons are present in Y.

(iii) For X, the atomic number is 11, so the electronic configuration will be {2,8,1}, hence it loses 1 electron to attain the electronic configuration of the nearest noble gas {2,8}. Hence its valency or combining capacity is 1.