100ml पानी के नमूने में 135mg / L CaCl2 और 95g/L MgCl2 मौजदू है। इसकी

कठोरता की वर्णन करें।​

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.