Question

directions: go to the phet simulation \build an atom\ to answer the following questions. click on the \atom\ screen first to begin. hint: do not type a space before or after an entry.
part 1: atom screen

1. which particle(s) are found in the center of the atom?
2. which particle(s) are found on the outside of the atom?
3. build the following atoms and type the name of each element you built.

a. an atom with 3 protons and 4 neutrons:
b. an atom with 2 protons and 4 neutrons:
c. an atom with 4 protons and 4 neutrons:

1. which particle(s) determine the name of the element you build?

directions: click on the green (+) button next to
et charge\. play with the simulation to discover which particles affect the charge of an atom or ion. then fill in the blanks below.

1. ions are just atoms with a net charge. fill in the blanks below to show your understanding of net charges:

a. positive ions have protons than electrons.

Explanation:

Question 1

In an atom, the center (nucleus) contains protons and neutrons. Protons have a positive charge, neutrons have no charge, and they are densely packed in the nucleus.

Electrons are the negatively charged particles that orbit the nucleus in electron clouds or shells, found outside the atomic nucleus.

The number of protons determines the element (atomic number). 3 protons mean atomic number 3, which is lithium. Neutrons add to mass but not element identity.

Answer:

protons, neutrons

Question 2