Compounds can form when atoms share electrons. what is this atomic bonding called?

ionic bond

metallic bond

covalent bond

cation exchange bonding

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

Argon is adiabatically compressed from an initial volume of 16 liters to a final volume of 2 liters. by what factor do the following quantities change? do they increase or decrease? (a) the rms speed (b) the thermal energy of the gas (c) the molar specific heat cv (d) the pressure

Could someone . i have tried to solve myself but my calculation is off