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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
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
Define: Chemical bond
Define: Relative atomic mass
Give two examples for each of ionic and covalent bond.
Who originated the word ‘atom’ ?
What are the building blocks of matter ?
State two observations which show that atom is not indivisible.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
In what respects do the three isotopes of hydrogen differ? Give their structures.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
A compound containing one atom of carbon and two atoms of oxygen is ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
1 mole of Gold and Silver contain same number of atoms.
The graphite refill used is pencil is made of element called ______.
The ______ are combination of atoms of various elements or the same element.
Atoms have a radius of the order ______.
