Atomic structure Quiz - ICSE Class 7 Science
Free practice quiz: Atomic structure (ICSE Class 7 Science). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which subatomic particle carries a positive charge?
- Electron
- Proton
- Neutron
- Photon
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Answer: B. Proton
Protons are positively charged particles found in the nucleus of an atom. Electrons are negatively charged and orbit the nucleus. Neutrons have no charge.
The electronic configuration of an element represents:
- The number of neutrons in the nucleus
- The arrangement of electrons in different energy shells or orbitals
- The total number of nucleons
- The charge of the atom
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Answer: B. The arrangement of electrons in different energy shells or orbitals
Electronic configuration describes how electrons are distributed among the various atomic orbitals and energy shells within an atom.
An atom with 17 protons and 18 neutrons is an isotope of an atom with 17 protons and 17 neutrons. What is the mass number of the first atom?
- 17
- 18
- 34
- 35
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Answer: D. 35
The mass number is the sum of protons and neutrons. For the first atom, it is 17 protons + 18 neutrons = 35.
Which of the following elements is a noble gas and has a full outermost electron shell?
- Lithium (Li)
- Neon (Ne)
- Oxygen (O)
- Sodium (Na)
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Answer: B. Neon (Ne)
Neon (atomic number 10) has an electron configuration of 2, 8, with a full outermost shell, making it a stable noble gas.
If an atom has 6 protons and 7 neutrons, what is its atomic number?
- 6
- 7
- 13
- 1
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Answer: A. 6
The atomic number is defined by the number of protons in the nucleus. This atom has 6 protons, so its atomic number is 6.