Answer:
4. A total of 8 valence electrons
Step-by-step explanation:
All atom in their ground state is at the actual state of electronic configuration. Argon has 18 number of electrons therefore, representing the electronic configuration using the Spdf rule is 1s²2s²2p6 3s²3p6 and also the configuration of argon is computed as 2 8 8 . The argon atom has fulfilled the octet rule . The valence/outer electron(8) is fully filled and therefore find it hard to give or accept any electron to form bonding.
Elements with fully filled octet configuration are known as inert gas or noble gas because they rarely bond with other atom of elements.