Question

what is the center of an atom; made up of protons and neutrons?*solidnucleusenergy levelcompoundwhich is a positively charge subatomic particle in the nucleus of an aelectronneutronelementprotonwhich is a neutral subatomic particle in the nucleus of an atom?electronneutroncompoundproton

Explanation:

• First question: An atom's center is the nucleus, which contains protons and neutrons.
• Second question: Protons are positively - charged subatomic particles in the nucleus. Electrons are negatively charged and outside the nucleus, neutrons are neutral, and elements are substances made of atoms.
• Third question: Neutrons are neutral subatomic particles in the nucleus. Electrons are negative, protons are positive, and compounds are made of two or more elements.

Answer:

• First question: Nucleus
• Second question: Proton
• Third question: Neutron