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प्रश्न
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
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उत्तर
In water, the ratio of oxygen to hydrogen is 8:1 by mass.
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संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
WRITE SHORT ANSWER
Define an ionic compound.
Write the names of `"Ca"("NO"_3)_2` compounds :
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An ion with negative charge is called _______
Name the particles which revolve around the nucleus.
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Define: An Atom:
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Does the particle have an excess of electrons or a deficiency of electrons ?
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A deficiency of electrons produces a ________ charge.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Define the following term:
Atom
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
What will be the charge present of the molecule XY after chemical combination?
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
Define – Atom.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
In all atoms of an element
Atoms of different elements having the same number of ______ are called isotones.
The graphite refill used is pencil is made of element called ______.
The most abundant type of atom is the universe is ______.
