Please select a subject first
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What is a neutron? State its relative mass and charge.
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What is the significance of the symbol of an element ? Explain with the help of an example.
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Explain the significance of the symbol H.
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The symbol of a metal element which is used in making thermometers is :
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The Latin language name of an element is natrium. The English name of this element is :
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A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a city
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A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a village
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The English name of an element is potassium, its Latin name will be :
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The drawing shows a ship 800 m from a cliff. A gun is fixed on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again.
(a) What is the name of this effect ?
(b) What happens to the sound at the cliff ?
(c) How far does the sound travel in 5 seconds ?
(d) Calculate the speed of sound.
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The scientist who proposed the first letter (or first letter and another letter) of the Latin or English name of
an element as its symbol, was :
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The atoms of which of the following pair of elements are most likely to exist in free state ?
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The speed of highly penetrating ultrasonic waves is :
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The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as
follows. Which symbol is the correct one ?
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The atomic number of an element X is 13. What will be the number of electrons in its ion X3+ ?
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The anion of an element has ______.
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An element which can exhibit valencies of 2, 4 and 6 can be :
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Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The elements X and Y are most likely to be respectively :
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The formula of the sulphate of an element X is X2(SO4)3. The formula of nitride of element X will be :
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A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :
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Define atomic mass unit. What is its symbol ?
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