Advertisements
Advertisements
प्रश्न
How many atoms of each kind are present in the following molecule:
water
Advertisements
उत्तर
Water (H2O) has two atoms of hydrogen and one atom of oxygen. The oxygen atom has six valence electrons. So it requires two electrons to form an octet structure.
APPEARS IN
संबंधित प्रश्न
Define a chemical bond.
Elements A, B and C have atomic number 17, 19 and 10 respectively.
- State which one is:
- a non-metal
- a metal,
- chemically inert?
-
Write down the formula of the compound formed by two of the above elements.
Fill in the blank.
___________ single covalent bonds are formed between the carbon and chlorine atoms.
Element X is a metal with a valency 2. Element Y is a non metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.
Name the following:
Metal with valency 2
\[\ce{^24_12Mg}\] and \[\ce{^26_12Mg}\] are symbols of isotopes of magnesium.
(a) Compare the atoms of these isotopes with respect to :
i. the composition of their nuclei
ii. their electronic configurations
(b) Give reasons why the two isotopes of magnesium have different mass numbers.
In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced.
Draw the geometric atomic structure of the three isotopes of hydrogen and the two isotopes of chlorine.
Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:
\[\ce{^40_20Ca}\]
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is a metal.
