Atomic Structure

Atomic Structure

1. +ve charged nucleus containing most of mass, surrounded by atomic shells with orbiting electrons containing negligible mass

2. Atomic/proton number gives no. of protons in nucleus; also defines the element and gives no. of electrons in an ATOM

3. No. of electrons is same as no. of protons in an ATOM, so atoms are electrically neutral

4. No. of electrons is different to no. of protons in an ION so charged: +ve = lost electrons, -ve = gained electrons; find original no. of electrons in atom (atomic no.) then add/subtract

5. ISOTOPES - ATOMS OF AN ELEMENT WITH DIFFERENT NUMBERS OF NEUTRONS AND DIFFERENT MASSES

6. Mass/nucleon number is no. of protons plus no. of neutrons. Find no. of neutrons by subtracting proton no. from mass no.

7. Different isotopes of same element react in same way - electrons involved in chemical reactions, not neutrons

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