3. Which of the following is not true for atoms? (4 points)

They combine to form elements and molecules.

They contain negatively charged electrons.

They are the building blocks of matter.

They are made up of elements.

They are made up of elements.

Explanation:

An atom is the smallest particle of matter that still retains the property of the element.

Two or more atoms combine to form elements or compounds. Elements are formed by two or more similar atoms, while compounds are formed by two or more different elements.

Atoms are made up of subatomic particles, protons, electrons and neutrons. Electrons are negatively charged, protons are positively charged while neutrons have no charge.

I hope this help! :)

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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