Yes.
In the case of BeCl2 and BF3, there are only 4 and 6 electrons on Be and B respectively and not eight.
Similarly, in the case of SF6 and PCl5, there are 12 and 10 electrons on S and P respectively and not eight.
Yes. When atoms with no charge combine with one or more atoms with no charge, it's called a molecule. They may share electrons to complete their octet.
More stable
Atoms can combine only if they are having an incomplete valence shell. They combine to attain an octet structure. They can also share electrons. There are some elements whose atoms do not combine, they are the inert gases.
More than 4 gain. Less than 4 lose and exactly 4 share
Yes, atoms beyond the second period in the periodic table can have an expanded octet, allowing them to hold more than eight electrons in their outer shell.
Two or more atoms combine to form a molecule.
The octet rule.
Yes, atoms with an octet are stable and less likely to react with other elements because they have a full outer shell. Octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell, making them more stable.
Atoms with a complete outer energy level or stable octet are more stable and less likely to react with other atoms. Inert gases like helium, neon, and argon have full outer energy levels and do not readily react with other elements, making them chemically stable.
molecules
The bolded statements are true:1. The octet rule can be violated. 2. Atoms are most stable when their atomic number is divisible by 8.3. All free atoms contribute eight valence electrons to form molecules.4. Only the oxygen atom can have an expandable octet.5. In order to obey the octet rule, some atoms have to share more than one pair of electrons.
a compound.