Which seasons are the northern and southern hemispheres experiencing in the image?
a.
it is summer in both the northern and southern hemispheres.
b.
it is summer in the northern hemisphere and winter in the southern hemisphere.
c.
it is winter in both the northern and southern hemispheres.
d.
it is winter in the northern hemisphere and summer in the southern hemisphere.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

the answer is c.the valence of the atoms combine .

0.88m hope i am correct : )

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.