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Integers — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSIntegers3 Marks
Question
Science Application: An atom consists of charged particles called electrons and protons. Each proton has a charge of $+1$ and each electron has a charge of $-1$. Remember number of electrons is equal to number of protons, while answering these questions: What will be the charge on an atom if it loses an electron$?$
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Answer

If an atom loses an electron, it will have $(a -1)$ electrons and a protons.
$\therefore$ Charge in one electron $= (-1)$
$\because$ Charge in $(a -1)$ electrons $= (a -1) \times (-1) = -(a -1) = (1 -a)$
$\therefore$Charge in one proton $= (+1)$
$\because$ Charge in a protons $= (+1) \times a = (+a)$
Hence, total charge on the atom $=$ Charge of electrons $+$ Charge of protons $= 1 -a + a = + 1$

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