The properties of electrons, protons and neutrons-
| Practile | Nature of Charge | Mass | Location |
|---|---|---|---|
| Electron | Electrons are negatively charged. | \(9 \times 10^{–31}\) kg | Extra nuclear part distributed in different shell or orbits. |
| Proton | Protons are positively charged. | \(1.672 \times 10^{–27}\) kg (1 µ) (approx. 2000 times that of the electron) | Nucleus |
| Neutron | Neutrons are neutral. | Equal to mass of proton | Nucleus |
(i) The kind of person the doctor is (money, possessions)
(ii) The kind of person he wants to be (appearance, ambition)
ABCD is a quadrilateral in which AD = BC and ∠ DAB = ∠ CBA (see Fig. 7.17). Prove that
(i) ∆ ABD ≅ ∆ BAC
(ii) BD = AC
(iii) ∠ ABD = ∠ BAC.
