The Atomic Theory, The Periodic Table, The Atoms and The Chemical Bond

Which subatomic particle is found orbiting around the nucleus?

• protons
• electrons
• neutrons
• nucleus

Which subatomic particle has a positive charge?

• Proton
• Electron
• Neutron
• Nucleus

Which subatomic particle has a negative charge?

• Protons
• Electrons
• Neutrons
• Nucleus

The center of the atom is called the....

• Proton
• Electon
• Neutron
• Nucleus

The _____________________ has a neutral charge.

• Proton
• Electron
• Neutron
• Nucleus

Which of the following distinguishes an element from all other elements?

• Its group in the periodic table
• Its color in solid form
•  Its number of protons
• Its phase at room temperature

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?

• Nitrogen (N)
• Sulfur (S)
• Arsenic (A)
• Silicon (Si)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table.For safety purposes, the scientist sprinkled some baking soda (NaHCO3) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

• The baking soda and hydrochloric acid combined, and bubbles formed.
• The baking soda absorbed the hydrochloric acid.
• Some of the baking soda dissolved in the hydrochloric acid.
• The hydrochloric acid evaporated, leaving only the baking soda.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?

• The total number of neutrons in the unknown element
• The total number of particles in the nucleus of the unknown element
• The number of protons in the nucleus of the unknown element
• The number of valence electrons in the unknown element

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following best describes an electron?

• It has no charge and about the same mass as a proton.
• It has a negative charge and much less mass than a proton.
• It has a positive charge and much more mass than a neutron.
• It has a negative charge and about the same mass as a neutron.

Tags

NGSS.MS-PS2-3