The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 3rd group and the 4th period?
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Atomic number of which of the following elements is greater than that of Copper?
____ is not an allotrope of carbon.
By which of the following processes are metals of high reactivity extracted from purified molten ore?
A change in which no new substances are formed is called _____________.
According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.
Which of the following represents an ion?
Name the reddish brown gas evolved when Lead Nitrate is heated strongly.
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