Question

What do these signs stand for on the periodic table \[Ta{\text{ }}Os{\text{ }}Rh\] ?
(A) Metalloids
(B) Metals
(C) Non-metals
(D) Gas

Answer 1

Hint: The signs Ta, Os and Rh stand for tantalum , osmium and rhodium in the periodic table. These are the substances which lose electrons to attain stability and hence they form cations. These are good conductors of heat and electricity generally they have a shiny surface with highly malleable and ductile.

Complete answer: Transition metals include tantalum $(Ta)$ , osmium $(Os)$ , and rhodium $(Rh)$ , which are all found at the middle of the periodic table.
"An element whose atom has a partially filled d subshell, or which can give birth to cations with an incomplete d subshell," according to the IUPAC definition. Any element in the d-block of the periodic table, which encompasses groups 3 to 12 , is referred to as a "transition metal" by many scientists.
Any element in the d-block of the periodic table, which encompasses groups 3 to 12, is referred to as a "transition metal" by many scientists. The f-block lanthanide and actinide series are also considered transition metals and are referred to as "inner transition metals" in practise.
From group 3 through group 7, early transition metals are found on the left side of the periodic table. Late transition metals, which range from group 8 to 11, are found on the right side of the d-block (and 12 if it is counted as transition metals). Transition elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
Hence, the correct option is (B) Metals.

Note:
The metals have a number of characteristics in common, including being solid at room temperature (with the exception of mercury) and being usually lustrous. The melting point is really high. An excellent heat conductor and a good electrical conductor.