Beryllium and Aluminium have similar properties because they
are both metals
belong to the same group
belong to the same period
are positioned diagonally to each other
Correct answer is A
No explanation has been provided for this answer.
carbon-14
phosphorus-32
cobalt-60
iodine-131
Correct answer is C
No explanation has been provided for this answer.
How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 \(^{23}\)mol]
1.20 x 10\(^{22}\)
2.4 x 10\(^{22}\)
1.51 x 10\(^{22}\)
3.02 x 10\(^{22}\)
Correct answer is C
No explanation has been provided for this answer.
0.40 moldm\(^{-3}\)
0.50 moldm\(^{-3}\)
0.05 moldm\(^{-3}\)
0.30 moldm\(^{-3}\)
Correct answer is B
No explanation has been provided for this answer.
Zn
Ca
Al
Pb
Correct answer is A
No explanation has been provided for this answer.