Why does your skin feel drier in winter

“It's that loss of moisture from upper layers of the skin that causes it to dry out.” Winter air is often dry, and the air that comes out of indoor furnaces can be even worse. However, dry skin can make its mark at other times of the year, too.

Explanation:

There are numerous reasons for having seasonal dry skin. The number one reason though is, Cold air holds less water. When water evaporates, it is drawn into the air, which "holds" it. 

Air can "hold" varying amounts of water. The warmer and drier the air, the more water it can hold. If the air has as much water it can hold, it is "saturated." If saturated air becomes cooler, the air loses some of its water-holding capacity and it has to lose some water, either as fog or rain or frost or possibly snow.

In the winter, the air can’t hold much water, so the air stays pretty dry. That is okay when you are outside, because even though the air is dry, it can’t draw much water from your skin, since its capacity is low anyway. (But if it is windy, you can still get pretty dry.)

The big problem is when you go inside, where the cold dry air is warmed up by the building’s heating system. Then the warm dry air has a huge capacity for water, and it sucks the water out of your skin like a leech.

Hope it helps dear.Please let me know

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

the answer is d.) potassium