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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A change in which no new substances are formed is called _____________.
Atomic number of which of the following elements is greater than that of Copper?
According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.
____ is not an allotrope of carbon.
By which of the following processes are metals of high reactivity extracted from purified molten ore?
Which of the following represents an ion?
What is the reaction between an acid and a base called?
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