Which of the following elements is a d-block element?
Calcium
lron
Lithium
Silicon
Correct answer is B
No explanation has been provided for this answer.
The energy change which accompanies the addition of an electron to a gaseous atom is
atomization
electron affinity
electronegativity
ionization
Correct answer is B
No explanation has been provided for this answer.
Which of the following equations represents beta decay?
\(\frac{14}{7}\)N + \(\frac{4}{2}\)He → \(\frac{8}{17}\)O + \(\frac{1}{1}\)H
\(\frac{8238}{92}\)U → \(\frac{234}{90}\)Th + \(\frac{4}{2}\)He
\(\frac{8238}{92}\)U → \(\frac{239}{93}\)Np + \(\frac{0}{-1}\)e
\(\frac{13}{7}\)N + \(\frac{4}{2}\)He → \(\frac{16}{8}\)O + \(\frac{1}{1}\)H
Correct answer is C
No explanation has been provided for this answer.
2He
10Ne
18Ar
36Kr
Correct answer is B
No explanation has been provided for this answer.
atomic number 17
atomic number 18
mass number 35
mass number 52
Correct answer is A
No explanation has been provided for this answer.