The diagram shows the electron configuration of an atom of an element for the electrons in the s and p orbitals.
diagram is attached to question.
what is the group number of the element in the periodic table?
a). 1
b). 2
c). 16
d). 17

The correct answer is Option C.

Explanation:

We are given an image having electrons around the nucleus of an atom.

Total number of electrons around the nucleus = 2 + 6 = 8

The electronic configuration of the element having 8 electrons is:  

As, the last electron is entering p-subshell, the element belongs to p-block of the periodic table.

The rule for determining the group number for p-block element is:

Group number = Number of valence electrons + 10

The number of valence electrons = 2 + 4 = 6

Group number = 6 + 10 = 16

Hence, the correct answer is Option C.

the answer is either b or c

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.