Question

What is the atomic number of 'Th' in modern periodic table

Answer 1

Answer:

the atomic number of thorium (Th) is 90 in the modern periodic table

it is a part of Actinides.

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Answer 2

$\large \: \underline{ \bold{ \underline{ \: Answer \: : \: \: \: }}}$

$\to$ Atomic number of " Th " = 90

$\large \: \underline{ \bold{ \underline{ \:\:Explanation : \: \: \: }}}$

$\to$ Thorium ( Th ) is a weakly radioactive metallic chemical element with atomic number 90

$\to$ Thorium is silvery and tarnishes black when it is exposed to air , forming thorium dioxide

$\to$ It is moderately hard , malleable , and has a high melting point