Answer:
C. Reacting
Explanation:
Halogens donot have one valence electron they have seven valnece electrons, they have one unpaired electron. Due to their high electron affinity they are considered most reactive non-metals in their respecitve period.
Answer:
Stone A
Explanation:
Measuring density is an easiest way to determine if two similar looking substances are same or not. Here also we need to perform the density test for each stone that is suspected to be fake diamond. We will calculate the density of each stone and compare it with the density of original diamond.
Density is calculated using the formula
It has been given in the question that both the substances have same volume of 0.15 .
Density of stone A = = 3.47 or after rounding off we get 3.5
Density of stone B = = 2.8
It is clear from the above calculation that the stone A has same density as the diamond but stone B lacks behind in density.
So, stone A could be the real diamond.
Answer:
d
Explanation:
the carbon is bonded once in a covalent bond
Answer:
element and compound.
Explanation:
reason
an element is a pure substance that cannot be broken down into simpler substances by any ordinary physical or chemical process.
and compound is a pure substance that consists of two or more elements held together in fixed proportions by natural forces called chemical bonds.
homogeneos and heterogenous mixtures are considered impure substances because they dont have a definite composition.