20. (Princeton-Chapter 3-4) Relative Number of Electrons 1.76 2.29 5 Binding Energy (MJ/nol) How many valence electrons does this atom have? TestDa (A) 2 (B) 3 (C) 4 (D) 5

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility

It is sure ( overimitation)

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.