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ایس اور پی بلاک عناصر
بارہویں جماعت · کیمیا · 5 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
جوابی کلید
1. D, 2. C, 3. D, 4. A, 5. 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.