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CTET Prep: Science Questions - Chemistry - Atomic Structure
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Avg score: 76% • Most missed: “An atom has 7 electrons in its M-shell and contains 18 neutrons in its nucleus. …”

An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton). All atoms are roughly the same size.

CTET Prep: Science Questions - Chemistry - Atomic Structure
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25 Questions

1. The nitrogen atom has 7 protons and 7 electrons. The nitride ion will have
2. 3 1H is also known as
3. The number of unpaired electrons in Mn2+ is
4. Which electromagnetic radiation is emitted by radioactive substances?
5. Consider the following parts of spectra:
1. Visible 2. Infrared
3. Ultraviolet 4. Microwave Which of the following is the correct sequence in which the wavelengths increase?
6. Nuclear particles responsible for holding all nucleons together are
7. Na+ ion is isoelectronic with
8. Discovery of the nucleus of an atom was due to the experiment carried out by
9. Radioactive isotope of hydrogen is
10. The absolute value of charge on electron was determined by
11. CN- ion is isoelectronic with
12. Bohr model can explain about
13. The concept of dual nature of radiation was proposed by
14. Which of the following waves can propagate in a vacuum?
1. Radio waves
2. Light waves
3. X-rays
4. Ultrasonic waves Select the correct answer using codes given below: Codes
15. Positive ions are formed from neutral atoms by loss of
16. Neutrino has
17. Any p-orbital can accommodate upto
18. The particle with 13 protons and 10 electrons is
19. Who discovered the electron?
20. The constituent particle of a nucleus in an atom are
21. Match list-I and list-II: List-I List-II
A. Thomson model
1. Dual nature of electron
B. Rutherford model
2. Nuclear theory
C. Bohr’s model 3. Plum pudding model
D. de-Broglie theory
4. Concept of quantisation of energy Codes A B C D
22. Al3+ is isoelectronic with
23. When spectral lines obtained from atomic spectra is placed in a magnetic field they are splitted into number of fine lines, this is called ……… .
24. 7Li3 and 8Be4 are called
25. The atoms of the elements having same mass number but different atomic number are called

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