Synonyms for the word particles: bits, crumbs, dots, dribble, drop, fleck, fragment, grain, hoot, iota, jot, minim, mite, modicum, molecule, morsel, mote, ounce, ray, scrap, scruple, seed, shred, speck, spot, stitch
You could use differences in density to separate seashells and sand. Since seashells are typically less dense than sand, you could use methods like flotation to separate them. Another physical property that could be used is size - sieve out the larger seashells from the smaller sand particles.
The particles in an atom are the protons, the neutrons, and the electrons.
The ancient Greek philosopher Democritus is credited with being the first person to use the term "atom" to describe the fundamental particles of matter. Democritus proposed that all matter is composed of tiny, indivisible particles called atoms.
Absolute zero is the lowest possible temperature, at which the motion of particles ceases completely. Scientists study the behavior of materials at absolute zero to understand fundamental properties of matter.
People used to talk about atomic power and atomic bombs, but this is not correct, nuclear is the correct word to use. Why do you want another word? Nuclear means to do with the nucleus. 'Kernel' is another word which means the center of a body but in English we use it for nuts. In German nucleus is 'kern', and they have 'kernkraftwerke' for nuclear engineering, but why use a German word?
There are many words you could use to replace the word take such as have. You could also use the word steal.
Another word is dehydrated.
S.o.s
One could use the word always.
I could use another chopstick, here.
You could use greet or welcome.
extreme
Another word, that can be used in place of Almost, is Nearly. You could also use About, or just about.
You could use the word bequeath, though that can mean given at time of death. You could use the word impart. Or you could use the word bestow, implying honor in the one receiving... whatever.
A kid, if it is your kid you could use 'my offspring.'
you could use diverse or complicated
Another word for simpler is easier. You could also use a phrase such as 'easier to understand', or just basic.