Question

molecules are
○ three or more atoms held together by chemical bonds
○ two or more atoms held together by electric bonds
○ compounds
○ two or more atoms held together by chemical bonds

electrons have a _____ charge.
○ compound
○ neutral
○ positive
○ negative

both protons and ______ are found in the nucleus of an atom.
○ negatives
○ ions
○ neutrons
○ electrons

Explanation:

First Question (Molecules are...):

• A molecule is defined as two or more atoms held together by chemical bonds. The first option is incorrect as it says three or more (molecules can have two atoms, like O₂). The second option is wrong because the bond is chemical, not electric. The third option is incorrect as not all molecules are compounds (e.g., O₂ is a molecule but an element, not a compound). So the correct option is "two or more atoms held together by chemical bonds".

• Electrons are known to have a negative charge. Protons have positive, neutrons are neutral, and "compound" is not a charge type. So the correct option is "Negative".

• The nucleus of an atom contains protons and neutrons. Electrons are in the electron cloud outside the nucleus. "Negatives" and "Ions" are not subatomic particles in the nucleus. So the correct option is "Neutrons".

Answer:

two or more atoms held together by chemical bonds

Second Question (Electrons have a ____ charge):