STEM Chem Midterm '25

Front

A neutral atom may contain 8 protons.

Back

9 neutrons and 8 electrons.

Front

Characteristics of the nucleus of an atom EXCEPT:

• is positively charged
• contains nearly all of the atom’s mass
• is very dense
• contains nearly all of the atom’s volume

Back

contains nearly all of the atom’s volume.

Front

The element Boron has two naturally occurring isotopes- one with an atomic mass of 10.01 and another with an atomic mass of 11.01. Which is the most abundant isotope?

Back

The one with an atomic mass of 11.01.

Front

How many valence electrons does an atom of magnesium typically have?

Back

2

Front

How many valence electrons does an atom of aluminum typically have?

Back

3

Front

Which of the following would NOT be found in the nucleus of an atom? protons, neutrons, electrons, quarks

Back

electrons

Front

Which statement about the arrangement of the periodic table is not true?

Back

Metals are found on the right side of the periodic table.

Front

Which of the following elements would be the best conductor of electricity? Bromine, Silicon, Nickel, Krypton

Back

Nickel

Front

Which of the following elements would be the most reactive? Bromine, Silicon, Nickel, Krypton

Back

Bromine

Front

Which of the following elements would be the least reactive? Bromine, Silicon, Nickel, Krypton

Back

Krypton