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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 gains an electron$?$
✓

Answer

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

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