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प्रश्न
Fill in the blank
An ion which has a positive charge is called a ..................
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उत्तर
An ion which has a positive charge is called a cation .
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संबंधित प्रश्न
Give the following a suitable word/phrase.
Atoms of same element with same atomic number but a different mass number.
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
Give reason
Actual atomic mass is greater than mass number.
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State Valency of each element
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State (i) Valency of each element (ii) which one is a metal (iii) which is non-metal (iv) which is an inert gas
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Carbon – \[\ce{^12_6C}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
The No. of electrons in the outermost shell of the atom of an inert gas ______.
An element has 2 electrons in its N shell.
- What is its atomic number?
- State its position in the periodic table.
- Is it a metal or a non-metal?
- State the name assigned to this group.
- What is the valency of this element?
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
