brodidit for students
ایس اور پی بلاک عناصر
بارہویں جماعت · کیمیا · 8 سوالات
نام: ____________________ تاریخ: ____________
Group IA elements have the outer electron configuration:
- A ns2 np1
- B ns2 np5
- C ns2
- D ns1
Which gas is released when sodium reacts with water?
- A Nitrogen
- B Chlorine
- C Hydrogen
- D Oxygen
The most abundant element in the Earth's crust is:
- A Iron
- B Silicon
- C Aluminium
- D Oxygen
Halogens exist as:
- A Diatomic molecules
- B Monatomic gases
- C Metallic solids
- D Triatomic molecules
Noble gases are unreactive because they have:
- A High density
- B Complete outer shells
- C Large size
- D One outer electron
Sodium is stored under:
- A Air
- B Alcohol
- C Water
- D Kerosene
The most abundant metal in the Earth's crust is:
- A Iron
- B Copper
- C Sodium
- D Aluminium
Which halogen is a liquid at room temperature?
- A Iodine
- B Bromine
- C Chlorine
- D Fluorine
جوابی کلید
1. D, 2. C, 3. D, 4. A, 5. B, 6. D, 7. D, 8. B
They have one electron in the outer s orbital.
2Na + 2H2O gives 2NaOH + H2.
Oxygen makes up about 46 percent of the crust by mass.
F2, Cl2, Br2 and I2 are diatomic.
Their outer shell is full.
It reacts with water and air.
Aluminium is about 8 percent by mass.
Bromine is a red brown liquid.