Question
Which is the lightest and most abundant chemical
element, constituting roughly 75 % of the Universeās elemental mass?Solution
The lightest and most abundant chemical element in the Universe is hydrogen. It constitutes about 75% of the elemental mass in the Universe. Hydrogen is also the first element in the periodic table, with the atomic number 1. It is a highly reactive element, and it can form a wide variety of compounds with other elements.
The principle that suggests recording expenses only when they are realized, and income only when they are certain, is known as:
If the sum of the roots of the quadratic equation 5xĀ² + bx + 4 = 0 is 9. then find the value of b.
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The Polymerase Chain Reaction (PCR) is used to :
The value ofĀ
Ā
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Study the given letter, symbol series and answer the question that follows.
L @ S * JĀ ^Ā B U # W R < E @ N S # B * H ! A & L < W Q
How ma...
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