Question

Symbol of sodium, copper and magnesium are respectively *


Na, Mg and Cu

Na, Cu and Mg

Mg, Na and Cu

Cu, Na and Mg
Symbol of chlorine and chloride are respectively *



Cl and cl-

Cl- and cL

Cl and Cl-

cl- and cl

Formula formed by a combination of silver and iodine is *



Agi

AGI

AgI

agI

Valency of potassium and chlorine are respectively *



+1 and +1

+1 and +2

+1 and -1

-1 and +1

The correct formula of calcium phosphate is *


Ca3(PO4)

Ca3(PO4)2

Ca(PO4)2

Ca2(PO4)3

The atoms of same element having same atomic number but different mass number are *


Isobars

Isotopes

Isomers

Isotherm
Chemical formula of aluminium hydroxide is *


Al(OH)

Al(OH)2

Al(OH)3

Al3(OH)

Atomic number of an atom is equal to ____ present in an atom *


Number of electrons

Number of protons

Number of neutrons

Number of electrons and protons

Sodium is written as 11Na23 which indicates that it has *


Atomic number 23 and mass number 23

Atomic number 11 and mass number 11

Atomic number 11 and mass number 23

Atomic number 11 and mass number 34

Mg(OH)2 is *


Magnesium oxide

Magnesium hydroxide

Milk of magnesia or magnesium hydroxide

Magnesium oxyhydrogen
​

Answer 1

• Mg(OH)2 is Magnesium Hydroxide , Milk of Magnesia

• 11Na23

✒ Atomic Number = 11

✏ Atomic mass = 23

• Atomic Number = no.of electrons in an atom

Symbol of

• Copper = Cu
• Sodium = Na
• Magnesium = Mg

Answer 2

Symbol of

Copper is Cu

Sodium is Na

Magnesium is Mg