Question

The Atom:
(a. is the basic unit of matter.b. is the unit of composition for elements.c. contains protons, neutrons, and electrons.d. has negatively charged particles circling around a positively charged nucleus. e. All of these statements about atoms are correct)

Answer 1

Answer:

E. All of these statements about atoms are correct.

Explanation:

• A. The Atom is the basic unit of matter because it is the smallest part of nature that not subdivide into other substances through ordinary chemical reactions. The word Atom cames from the greek ἄτομος that means indivisible.

• B. It is the unit of composition for elements. Each element has specific chemical and physical properties and a unique number of protons, also called number Z.

• C. It contains protons, neutrons, and electrons. Protons are the positively charged particles, neutrons have no charge. Protons and neutrons form the nucleus and they are responsible for most of the mass of the atom. The electrons are negatively charged particles that have almost no mass.

• D. It has negatively charged particles circling around a positively charged nucleus. The negative and the positive charges are opposite and they attract one another, this is the reason why the electrons are circling around the nucleus formed by protons and neutrons.