Consider the substances below.• 1 mol of beryllium• 1 mol of salt• 1 mol of water• 1 mol of hydrogenwhich statement is true about these substances? 1) they have exactly the same mass.2) they have different numbers of particles.3) they have the same number of atoms.4) they have different masses.

The correct answer is option 4) They have different masses

Explanation

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Let's solve this!

Let's analyze each of the options:

1) They have exactly the same mass: this option is not correct because all substances have different mass

2) They have different numbers of particles: this option is incorrect because, the elements have the same number of particles (the number of avogadro), but the compounds do not.

3) They have the same number of atoms: it is incorrect because they do not have the same number of atoms

4) They have different masses: this is correct, each one has its own mass.

After the analysis we conclude that the correct answer is option 4) They have different masses

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.