Which of the following elements is a metalloid?
Carbon
Oxygen
Silicon
Sodium
Correct answer is C
Some examples of metalloids include boron, silicon, germanium, arsenic etc.
ll only
l and ll only
l and lll only
ll and lll only
Correct answer is C
The properties of radioactive elements holds true except that radioactive decay is not dependent on external conditions except electron capture and bombarding the radioactive material with subatomic particles.
The d-block elements are paramagnetic because they
contain paired electrons which are repelled by magnetic field
contain unpaired electrons in the partially filled 3d-orbital
contain paired electrons which are repelled by magnetic field force
have delocalized valence electrons
Correct answer is B
Paramagnetism is a characteristic possessed by an atom with an unpaired electron.
Two elements, X and Y are in the same group on the periodic table because they both have the same
number of electronic shells
number of valence electrons
atomic size
atomic number
Correct answer is B
The members of the same group always have the same number of electrons in the outer shell (i.e number of valence electrons).
The atomic radii of metals are usually
greater than their ionic radii
equal to their ionic radii
less than their ionic radii
less than those of non-metals in the same period
Correct answer is A
Metals give off electrons. This means that atomic radius is always greater than the ionic radius for metals.