Question

choose the best answers.
2.4)__scientists use__and computers to investigate atomic particles.
a. supercolliders
b. telescopes
c. thermometers
2.5)____what are the three main parts of an atom?
a. water, hydrogen, and oxygen
b. molecules, compounds, and elements
c. protons, neutrons, and electrons
match the parts of an atom with the descriptions.
2.6)____protons
2.7)____neutrons
2.8)____electrons
a. particles that have a negative charge
b. particles that have no charge
c. particles that have a positive charge
underline the best answers.
2.9) protons and neutrons are found in the (electron cloud, nucleus).
2.10) electrons are found in the (electron cloud, nucleus).
elements
there are different types of atoms that exist in the natural world. these are called elements. the elements are like building blocks. each element is different from another element because it has a different number of protons in its nucleus. different combinations of the elements make different types of matter.
different elements include oxygen, nitrogen, carbon, gold, and silver. there are known elements. there are 98 elements found naturally on the earth. the other are made by scientists in a laboratory. new elements continue to be discovered scientists in laboratories.

Explanation:

• 2.4: Supercolliders are used to accelerate and collide atomic particles for investigation. Telescopes are for observing distant objects (not atomic particles), and thermometers measure temperature.
• 2.5: Atoms are composed of protons (positive charge), neutrons (no charge), and electrons (negative charge). Options A and B list substances or groupings of substances, not parts of an atom.
• 2.6 - 2.8: Protons have a positive charge (C), neutrons have no charge (B), and electrons have a negative charge (A).
• 2.9: Protons and neutrons are located in the nucleus of an atom.
• 2.10: Electrons are found in the electron cloud surrounding the nucleus.

Answer:

2.4) A. supercolliders
2.5) C. protons, neutrons, and electrons
2.6) C
2.7) B
2.8) A
2.9) nucleus
2.10) electron cloud