Chemistry Bell Ringer for 3/18/25

Front

How many electrons should sodium, atomic number 11, have around its Lewis dot diagram?

Back

Sodium has 1 electron in its outer shell, represented in the Lewis dot diagram.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals. An example is arsenic.

Front

How many protons does titanium have?

Back

Titanium has 22 protons.

Front

What is an isotope?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons.

Front

Which isotope contains 12 protons and 13 neutrons?

Back

The isotope is Magnesium-25 (Mg-25).

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

Define Lewis dot structure.

Back

A Lewis dot structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist.

Front

What is the significance of valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom and are important for chemical bonding.

Front

How do you determine the number of neutrons in an isotope?

Back

The number of neutrons can be found by subtracting the atomic number from the mass number.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.