What is the mass number of an atom containing 4 protons and 5 neutrons? How many total electrons would that neutral atom contain?
What is the element?
Will this element gain or lose electrons?
How many total electrons would an ion of that element have?
What is the charge on that ion (ex. +1, -1, +2, -2, etc.)?
Is this ion an anion or cation?
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What other element has the same number of electrons as the ion you have identified?

- 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

elements make up everything, and they combine to make compounds.

the answer is c

the correct answer to this question is 2

more infor would

a lot