Advertisements
Advertisements
प्रश्न
Fill in the blank
A deficiency of electrons produces a ________ charge.
उत्तर
A deficiency of electrons produces a positive charge.
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
Write the names of the elements present in the :-
Sulphuric acid
Fill in the blank:
Atoms are _____
Define: Chemical bond
Name the particle or particles you would expect to find in :
The orbit of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X ?
What are the building blocks of matter ?
Name the unit in which the radius of an atom is usually expressed.
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
One nm is equal to :
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
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 will form negative ion?
The basic unit of matter is ______.
Define the following term with an example.
Compound
Which of the following statements made by Dalton has not undergone any change?
Atoms of different elements having the same number of ______ are called isotones.
The graphite refill used is pencil is made of element called ______.
The smallest unit of an element is ______.
______ is a substance that is made up of three oxygen atoms chemically combined.
