The shape of a graphite crystal is
tetrahedral
pyramidal
hexagonal
octahedral
Correct answer is C
Graphite is a crystalline form of the element Carbon. The atoms are arranged in a hexagonal structure.
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).