Which one of the following gases is mainly present in the atmosphere of planet Mars?
The atmosphere of Mars is primarily composed of carbon dioxide (CO₂), making up approximately 95% of the Martian atmosphere. The remaining components include nitrogen (2.6%), argon (1.9%), and trace amounts of oxygen and water vapor. Mars has a very thin atmosphere, with a pressure that is less than 1% of Earth's, which makes it incapable of supporting life as we know it.
Which of the following is NOT a Döbereiner’s triad?
In which of two groups of elements have highly negative electron gain enthalpies and readily add one or two electrons respectively to attain the stable noble gas configuration?
Which of the following elements is classified as a lanthanoid group element?
Given below are two statements:
Statement I: The period number in the long form of the periodic table is equal to magnetic quantum number of any element of the period.
Statement II: The period number in the long form of the periodic table is equal to maximum principal quantum number of any element of the period.
In the light of the above statements, choose the correct answer from the options given below:
Which of the following elements is calssified as an actinoid group element?
Which group did iodine belong to in Mendeleev’s table?
