Hydrogen gas has the noble gas electron configuration with a single covalent bond; it only requires two electrons for this (you've probably heard the "duet rule").
Otherwise, in the right conditions, you can maybe combine two atoms in the 4A group (Carbon, Silicon, Germanium, Tin, Lead, etc.), or an atom in the 3A plus an atom in the 5A group. All other combinations would be considered ionic bonds.
They achieve noble gas configuration by the sharing of electrons.
Generally by losing electrons and forming cations.
The atoms in molecules achieve electron configurations of the noble gases by sharing electrons between the atoms.
Two atoms share two electrons.
Krypton is a noble gas and already has noble gas configuration.
Krypton is already a noble gas and hence need not gain noble gas configuration.
loses 2 electrons to achieve a noble gas configuration
Iodine accepts one electron to achieve noble gas configuration. Strontium loses two electrons to achieve noble gas configuration. Nitrogen accepts three electrons to achieve noble gas configuration. Krypton already has a noble gas configuration.
Oxygen should gain 2 electrons to achieve noble gas configuration
Krypton is a noble gas and already has noble gas configuration.
Krypton is already a noble gas and hence need not gain noble gas configuration.
loses 2 electrons to achieve a noble gas configuration
Losing an electron cesium has a noble gas configuration.
4 but it will need energy, so carbon gain 4 electrons to achieve a noble gas configuration.
Iodine accepts one electron to achieve noble gas configuration. Strontium loses two electrons to achieve noble gas configuration. Nitrogen accepts three electrons to achieve noble gas configuration. Krypton already has a noble gas configuration.
Oxygen should gain 2 electrons to achieve noble gas configuration
Calcium has to lose 2 electrons to form noble gas configuration.
Selenium should gain two electrons and lose six electrons to achieve a noble gas electron configuration.
-3 charge. Nitrogen has to gain three electrons to achieve the noble gas configuration of neon, so it will have -3 charge (as in N3- ion or nitride ion)
They usually achieve "Noble Gas" configuration
There is no noble gas configuration for hydrogen.