TEKS 8.5ABC Pre-Test

Front

What is the charge of the nucleus of an atom?

Back

The nucleus of an atom has a positive charge due to the presence of protons.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that determine its chemical properties.

Front

Which element has two valence electrons?

Back

Magnesium (Mg) has two valence electrons.

Front

What is the definition of malleability in metals?

Back

Malleability is the ability of a metal to be shaped or bent without breaking.

Front

Which group of elements are known to be malleable, conduct electricity, and are lustrous?

Back

Copper (Cu), Sodium (Na), and Magnesium (Mg) are malleable, conduct electricity, and are lustrous.

Front

What particles are found in the nucleus of an atom?

Back

The nucleus contains positively charged protons and neutral neutrons.

Front

How many protons does an atom with a +25 charge in its nucleus have?

Back

An atom with a +25 charge in its nucleus has 25 protons.

Front

What is the role of neutrons in an atom?

Back

Neutrons help stabilize the nucleus and do not have a charge.

Front

What is the difference between protons and electrons?

Back

Protons are positively charged particles found in the nucleus, while electrons are negatively charged particles that orbit the nucleus.

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.