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Which one of the following is the Least conductor of heat?

Which one of the following is the most precious metal?

What is the Density of Calcium?

Which non-metal is extremely hard?

The number of isotopes of the elements with an even mass number and even atomic number are;

Moles of aluminum and oxygen react with each other to produce aluminum oxide. The amount of product form is;

The symbol used for the potassium element is;

The concept of the presence of a nucleus in an atom was given by which one of the models?

Proton is one of the fundamental particles of atom. What is nature of its charge and mass?

fundamental particles of atom

Which of the following properties is associated with all of the elements in a group of the periodic table?