chlorine would need only one electron to attain an octet structure.
Silver needs 7 more electrons to reach a "pseudo-noble gas" configuration.
three
carbon has to gain or lose 4 electrons to gain noble gas configuration.
it has to gain 3
One
loses 2 electrons to achieve a noble gas configuration
Calcium will lose two electrons to gain the noble gas configuration of Argon.
nitrogen has 5 valence electrons. It should gain 3 electrons to achieve a noble gas configuration.
Silver needs 7 more electrons to reach a "pseudo-noble gas" configuration.
three
Two.
Nitrogen has to gain three electrons
Boron must give up 3 electrons in order to achieve a noble-gas electron configuration.
carbon has to gain or lose 4 electrons to gain noble gas configuration.
in order to attain the nearest noble gas configuration.
it has to gain 3
Phosphorus has to gain a total of 3 electrons to achieve a noble gas configuration. You can find this for any non-metal because the last digit of its group number is the number of valence electrons it has. For example Phosphorus has 5 and Sulfur has 6. In order to achieve a noble gas electron configuration, you must have 8 valence electrons, so phosphorus must gain 3.