Which feature defines a neutral atom?

The feature that defines a neutral atom is the number of electrons equal to the number of protons. In a neutral atom, the positive charge of the protons in the nucleus is balanced by the negative charge of the electrons surrounding the nucleus, resulting in no overall charge.

What are valence electrons

the electrons surrounding an atom's nucleus
electrons that are exchanged between atoms
the electrons in an atom's outermost energy level
electrons that are shared between atoms

Valence electrons are the electrons in an atom's outermost energy level. These electrons are important because they are involved in chemical bonding and reactions, determining how an atom interacts with other atoms.

What are valence electrons

Valence electrons are the electrons that reside in the outermost shell (or energy level) of an atom. They play a crucial role in chemical bonding and reactivity, as they are the electrons involved in forming bonds with other atoms. The number of valence electrons determines an element's chemical properties and its ability to gain, lose, or share electrons during reactions. For example, the elements in the same group of the periodic table have similar valence electron configurations, which accounts for their similar chemical behavior.

What are valence electrons

the electrons surrounding an atom's nucleus
electrons that are exchanged between atoms
the elections in an atom's outermost energy level
electrons that are shared between atoms

Valence electrons are the electrons in an atom's outermost energy level. These are the electrons that participate in chemical bonding and reactions, influencing how an atom can interact with others.

Why do atoms exchange or share electrons during bonding

to have eight inner level electrons
to obtain a full outer electron shell
to attract an ion with the opposite charge
to become neutral

Atoms exchange or share electrons during bonding to obtain a full outer electron shell. This process helps them achieve greater stability, often following the "octet rule," which states that atoms tend to fill their outermost shell with eight electrons. By doing so, they can become more stable and less reactive.

How many valence electrons are in an atom of the element fluorine?

five
two
seven
eight

An atom of the element fluorine has seven valence electrons. Fluorine is in group 17 (the halogens) of the periodic table, and elements in this group have seven electrons in their outermost shell.

Which change is likely to happen to an atom of the element strontium (Sr) during bonding

It will gain electrons, forming a negative ion
it will give up electrons, forming a positive ion
It will give up electrons, forming a negative ion
It will gain electrons, forming a positive ion

An atom of the element strontium (Sr) is likely to give up electrons, forming a positive ion. Strontium is an alkaline metal found in group 2 of the periodic table and typically loses its two outermost valence electrons to achieve a stable electron configuration, resulting in a \( \text{Sr}^{2+} \) ion.