Atoms And Molecules

Matter is made of ____
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Atoms
The first scientific theory of the atom was proposed by _____
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John Dalton
Atoms of the same element may have different____
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Atomic mass
Atoms of different elements may have same ___
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Atomic masses
____ is the smallest particle that takes part in a chemical reaction
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Atom
Anything that has mass and occupies space is called ____
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Matter
___ are the building blocks of matter
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Atoms
Atom contains subatomic particles such as_____
_____ don’t have a considerable mass
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Electrons
The mass of an atom is mainly contributed by its____
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Protons and Neutrons
The sum of the number of protons and neutrons of an atom is called its ____
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Mass number
The mass of an atom is measured in
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Atomic mass unit (amu)
Atomic mass unit is one-twelfth of the mass of a____
An isotope of carbon, which contains___
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6 protons and 6 neutrons
The mass of a proton or neutron is approximately____
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1 amu
In the beginning, the mass of ___ atom was chosen as a standard and
masses of other atoms were compared with it.
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Hydrogen
The stable isotope of ___ with atomic mass 12 is used as the standard for measuring the relative atomic
mass of an element
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Carbon (C-12)
If the atomic mass of an element is expressed in grams, it is called as ___
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Gram Atomic Mass
Gram Atomic Mass of hydrogen___
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1 g
Gram Atomic Mass of carbon___
Gram Atomic Mass of nitrogen___
Gram Atomic Mass of oxygen___
The ____ of an element is the weighted average of the masses of its naturally occurring isotopes.
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Average atomic mass
Atomic mass of Hydrogen is____
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1.008
Atomic mass of Helium is ____
Atomic mass of Lithium is____
Atomic mass of Beryllium is ___
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9.012
Atomic mass of Boron is ____
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10.811
A _____ is a combination of two or more atoms held together by strong chemical forces of attraction, i.e. chemical bonds.
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Molecule
If the molecule is made of similar kind of atoms,then it is called ____
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Homoatomic molecule
The molecule that consist of atoms of different elements is called ____
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Heteroatomic molecule
In oxygen molecule, there are ___ oxygen atoms
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Two
____ contains three oxygen atoms and hence it is called homotriatomic molecule.
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Ozone (O3)
If a molecule contains more than three atoms, then it is called ____
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Polyatomic molecule
____ does not exist in free state except in noble gas
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Atom
_____exists in a free a state
____& are less reactive
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Molecules
____ does not have a chemical bond
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Atom
Chemists measure atoms and molecules in____
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Moles
One mole of an element contains ____ atoms
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6.023 × 1023
____ law states that equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules?
Molecular formula of gases can be derived using ____ law
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Avogadro