Chemistry Unit Review

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

Front

How many valence electrons does Silicon (Si) have?

Back

Silicon has 4 valence electrons.

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

What is the atomic number of Nickel (Ni)?

Back

The atomic number of Nickel is 28.

Front

Who proposed that atoms cannot be divided?

Back

John Dalton proposed that atoms cannot be divided.

Front

What does the symbol 'H' represent in the periodic table?

Back

The symbol 'H' represents Hydrogen.

Front

What are Transition Metals?

Back

Transition Metals are elements found in the d-block of the periodic table, known for their ability to form variable oxidation states and colored compounds.

Front

In which section of the periodic table are Transition Metals located?

Back

Transition Metals are located in the orange section of the periodic table.

Front

What is the significance of the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, reflecting the number of protons and neutrons in the nucleus.

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.