Question

atomic structure
are the smallest unit of an element.
are composed of three subatomic particles: protons, neutrons, and electrons.
the nucleus - the center of the atom.
contains the majority of the atoms mass.
protons - positively - charged particles
that exist in the nucleus of the atom.
neutrons - neutral particles that exist
in the nucleus of the atom.
electrons - negatively - charged
particles that surround the nucleus.
since atoms have a neutral charge overall, the number of protons
(positive) and the number of electrons (negative) must be equal.
quick review:

1. what is the center of the atom called? _
2. the atom above contains how many protons? _
3. the atom above contains how many electrons? _
4. what is the name of the negative subatomic particle? _

Explanation:

1. La definición del núcleo en el texto es "the center of the atom".
2. En la figura, se ven dos partículas con carga positiva (protones).
3. El texto dice que "the number of protons (positive) and the number of electrons (negative) must be equal", por lo que si hay 2 protones, hay 2 electrones.
4. El texto define a los electrones como "negatively - charged particles".

Answer:

1. The nucleus
2. 2
3. 2
4. Electrons