A10-month-old baby is interested in discovering different textures, comparing the touch sensations between a soft blanket and a hard wooden block. tactile signals such as these are received by the lobe

Tactile signals are received by the PARIETAL lobe. 

This part of the brain is the one that processes basic sensations such as temperature, touch, pressure, pain, and stores the learnt data.

A 10-month-old baby starts to develop this part of the brain as you can see them staring to pick up objects and explore their surroundings.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.