Read the following passage
before rutherford conducted the gold foil experiment, the "plum pudding" model proposed by j. j. thomson offered an explanation for the structure of the atom
rutherford, along with two of his associates hans geiger and emest marsdenperformed an experiment in which an extremely thin metal foil was fired with a beam
of alpha particles. the results of the experiment were recorded accurately by another scientist who observed the frequency of alpha particles that passed through the
foil unobstructed
use information from the passage to justify whether the characteristics of reliable scientific explanations are present in the development of the atomic theory.

- 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

0.88m hope i am correct : )