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If an element A atom has 18 protons, it follows that A has 18 electrons. So, the number of electrons in an A+ will be -
- a)21
- b)20
- c)19
- d)17
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If an element A atom has 18 protons, it follows that A has 18 electron...
Key Points
- Element A has 18 protons.
- The number of protons in an atom is also known as its atomic number and it determines the identity of the atom.
- In an electrically neutral atom, the number of protons is equal to the number of electrons. So, in an atom of element A, which is neutral, there are also 18 electrons.
- The symbol A+ denotes an ion of element A. An ion is an atom or group of atoms that have gained or lost one or more electrons, giving it a net positive or negative charge.
- The "+" sign denotes that the atom has lost an electron.
- It is positive because the number of positively charged protons now exceeds the number of negatively charged electrons.
- Therefore, the A+ ion will have one fewer electron than a neutral A atom. Given that the neutral A atom has 18 electrons, the A+ ion will have 17 electrons
Most Upvoted Answer
If an element A atom has 18 protons, it follows that A has 18 electron...
Explanation:
Number of Electrons in A+ ion:
- An element A with 18 protons will have 18 electrons in its neutral state.
- When an element loses one electron to form a +1 ion, it will have one less electron than its neutral state.
- Therefore, the number of electrons in A+ ion will be 18 - 1 = 17 electrons.
Therefore, the correct answer is option 'D' - 17.
Number of Electrons in A+ ion:
- An element A with 18 protons will have 18 electrons in its neutral state.
- When an element loses one electron to form a +1 ion, it will have one less electron than its neutral state.
- Therefore, the number of electrons in A+ ion will be 18 - 1 = 17 electrons.
Therefore, the correct answer is option 'D' - 17.
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