An electron is approximately 0.05% of the mass of a proton. Protons and neutrons each have a mass of 1 amu. Which of the following best describes the relationship between mass and subatomic particles? A. The mass of an electron is equal to that of a neutron
B. Atomic mass is the total number of protons and electrons
C. A neutron has 0.05% more mass than an electron
D. The nucleus comprises over 99% of the atom's mass

D. The nucleus comprises over 99% of the atom's mass.

Explanation:

Which of the following best describes the relationship between mass and subatomic particles?

A. The mass of an electron is equal to that of a neutron.  FALSE. The mass of an electron is ≈1/1,840 of that of a neutron.

B. Atomic mass is the total number of protons and electrons.  FALSE. Atomic mass is the total number of protons and neutrons.

C. A neutron has 0.05% more mass than an electron.  FALSE. A neutron has 0.05% more mass than a proton.

D. The nucleus comprises over 99% of the atom's mass. TRUE. The nucleus comprises protons and neutrons.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms