Since platinum is a metal it will tend to lose electrons.
Usually lose, but in a hydrogen molecule, the two atoms do one each.
Loses
Covalent bonds do not gain or lose electrons, but rather share electrons.
they share electrons
yes
Atoms gain, share, or lose electrons to try and become more stable. Atoms will gain, share, or lose electrons until they have a stable 8 valence electrons in their outer shell which is called an octet, which is stated in the octet rule. See the attached links for information on the octet rule.
Carbon needs to either gain 4 electrons or lose them. This is extremely difficult and energetically unfavorable. It is far easier to share them instead.
Covalent bonds do not gain or lose electrons, but rather share electrons.
When atoms lose and gain electrons, an ionic bond will form. When atoms share electrons, a covalent bond will form.
It gains
Radium lose two electrons, the cation is Ra2+.
they share electrons
To form a molecule, atoms can share, lose, and gain electrons
yes
Some atoms lose electrons, some gain electrons, and some share electrons depending on what elements are involved and what compound is forming.
Atoms gain, share, or lose electrons to try and become more stable. Atoms will gain, share, or lose electrons until they have a stable 8 valence electrons in their outer shell which is called an octet, which is stated in the octet rule. See the attached links for information on the octet rule.
silicon prefers to share electrons forming covalent bonds
This depends on the electronegativity of atoms.
A completely filled shell of electrons has 8 electrons.