8-сынып химия

The most adundant metal in the Earths crust.It is light and used in airplane construction,food packaging,car industry.

• Fe

• Al

• Cb

• Zn

An excellent conductor of electricity.Used in electricity wires and the main component of the bronzo alloy, main ores are located in Zhezkazgan region

• Mg

• Fe

• Cu

• Zn

Which elements have similar chemical properties to chlorine

• Na.K.Li.Rb.Cs

• F.I.Br.At.

• Ca.Mg.Be.Ba

• Al.B.Ga.In

Which elements are found in the gaseous state in the form of monoatomic structure at room temperature

• Na,K,Li,Cs

• He,Ne,Ar,Kr,

• N,P,As,Sb

• Be.Mg.St.Ca

Find the numbers of valence electrons for the element Mg

• 3

• 2

• 1

• 4

The atomic mass number of X is -70, and the number of neutrons of 39. What are the group and period numbers of element X in the Periodic table?

• IV .V

• III,IV

• III,V

• I,II

Among the 4 period elements,which of them have 4 valence electrons?

• Ga

• Ge

• C

• Si

Which one the fruits in the most acidic?

• Apple

• Lemon

• banana

• grapes

Used in the production of cement

• KOH

• NaOH

• Ca(OH)2

• Mg(OH)2

Used in the production of many chemicals, silc, soap,paper,textiles.dyes and detergent

• NaOH

• KOH

• LiOH

• CsOH