Magnesium + Nitric Acid + Mg + HNO3 +
Silver + Hydrochloric Acid + Ag + HCL +
Copper Sulphate + Hydrogen
Lead + Sulphuric Acid Pb + H 2SO 4
Copper + Nitric Acid
+ +
+
Cu + HNO3 +

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

the answer is 75.0%.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

answermeridional ;