Midterm Review - THE ATOM and THE PERIODIC TABLE

A model of a helium (He) atom is shown below.

Which numbered part of the helium atom represents a proton?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

A model of a helium (He) atom is shown below.

Which numbered part of the helium atom represents a neutron?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Where is most of the mass of the atom located?

• in the nucleus

• in the protons

• in the neutrons

• in the electron cloud

Where are electrons located in an atom?

• with the quarks

• with the neutrons

• outside the nucleus

• near the protons

What do carbon, hydrogen, and oxygen atoms have in common?

• the same number of electrons

• the same number of protons

• neutrons located outside the nucleus

• electrons located outside the nucleus

Tags

NGSS.MS-PS1-1

The element at the top of the far-right column of the periodic table is helium. Which statement is correct about the other elements found in this column?

• Some of the other elements in this column are solids at room temperature.

• Some of the other elements in this column are liquids at room temperature.

• All the other elements in this column have chemical properties similar to those of helium.

• None of the other elements in this column has physical properties similar to those of helium.

According to the periodic table of the elements, which set of elements has similar properties?

• He, Ne, Ar

• Na, Ca, Al

• He, H, Al

• H, C, I

The element krypton is a gas that shows almost no chemical activity. To find another element with similar properties, what should a student look for on the periodic table of the elements?

• an element with the same atomic mass

• an element with the same net charge

• an element in the same period

• an element in the same group

The periodic table of the elements organizes elements according to their properties. A section of the periodic table is shown.

Which set of elements below is the most similar in chemical behavior?

• Be, Ca, Ra

• Ti, V, Cr

• Fr, Ra, Rf

• H, Be, Sc

The element sodium, Na, has an atomic number of 11 and an atomic mass of 23.0 atomic mass units (amu). Which of these elements is MOST LIKELY to have similar chemical reactivity as sodium?

• potassium, K, which is in the same group on the periodic table

• aluminum, Al, which is in the same period on the periodic table

• magnesium, Mg, which has an atomic mass of 24.3 amu

• neon, Ne, which has a similar symbol