Chemical tests show that it is an alkaline earth metal. (a) The family of alkaline earth metals lies in group II of the periodic table indicating that each member of this family has 2 valence electrons. This therefore implies that the new element must also have only 2 electrons in its outermost orbit.
Answer:
Temperature and Pressure
Explanation:
Temperature and pressure cause change in volume.
So any change in volume will alter the ratio of density as given by equation of density.
Density = mass/ volume
Change in volume will alter the ratio.
Kindly mark it branliest if the answer is little bit satisfying.
Explanation:
DNA is composed of large amount of amino acids and have a lot of amide groups .
Therefore , in the acidic or in basic medium , the DNA molecules is either dissociated or dis stabilized via protonation or de protonation .
<u>The double helix structure of the DNA may break or get dis ordered .</u>
But , from the question , In sodium phosphate buffer at pH = 7.0 , is the neutral condition , hence , the DNA remains unchanged , because of the neutral medium .
And in pure water ,
The DNA molecule remains intact as , in pure water , there are no ions .
Answer:
The average atomic mass of bromine is 79.9 amu.
Explanation:
Given data:
Percentage of Br⁷⁹ = 55%
Percentage of Br⁸¹ = 45%
Average atomic mass of bromine = ?
Formula:
Average atomic mass = [mass of isotope× its abundance] + [mass of isotope× its abundance] +...[ ] / 100
Now we will put the values in formula.
Average atomic mass = [55 × 79] + [81 ×45] / 100
Average atomic mass = 4345 + 3645 / 100
Average atomic mass = 7990 / 100
Average atomic mass = 79.9 amu
The average atomic mass of bromine is 79.9 amu.
It’s is a pure substance because nothing is mixed with it and a molecule gas because it’s is a gas and it’s by its self