The document provides information about the fundamental particles that make up atoms, including protons, neutrons, electrons, and isotopes. It defines key atomic properties such as atomic number, which is the number of protons in an atom's nucleus, and mass number, which is the total number of protons and neutrons. It notes that atoms of the same element can have different numbers of neutrons, making them isotopes. As an example, it provides the particle makeup of several carbon isotopes: 12C, 13C, and 14C.

1. Introduction to AtomsThe Fundamental particles of Atoms

2. Match the word in the left to rightpositive electrical charge particleAtomic number1No charge particle 2Isotopenegative electrical charge particle3neutronproton number of protons +neutron 4Atomic mass number of protons in the nucleus5Atoms of the same element but different mass numberelectron6

3. atomAn _____is the smallest particle of an element that has the chemical properties of the element.Copper atoms on silica surface.Distance across = 1.8 nanometer (1.8 x 10-9 m)

4. The AtomDid you know an atom consists of a …..nucleuselectronsElectron cloudNucleus

5. ATOM COMPOSITIONThe atom is mostly empty spaceThere are protonsand neutrons in the nucleus.

6. electronsin space around the nucleus.the number of electrons is equal to the number of protons.

7. ATOMIC COMPOSITIONProtons (p+) + ve electrical charge

8. mass = 1.672623 x 10-24 g

9. relative mass = 1.007 atomic mass units (amu) but we can round to 1Electrons (e-)−veelectrical charge

10. relative mass = 0.0005 amubut we can round to 0Neutrons (no)no electrical charge

11. mass = 1.009 amubut we can round to 1Atomic Number, ZAll atoms of the same element have the same number of protons in the nucleus, Z

12. Mass Number, AC atom with 6 protons and 6 neutrons is 12 atomic mass unitsB atom with 5 protons and 5 neutrons is 10 atomic mass unitsWhat is mass number?Mass Number(A)= # protons + # neutrons

13. Atomic numberAtomic symbolAtomic Mass(AVERAGE)Nuclear symbolAXZ(or Mass number)

14. Atomic numberAtomic symbolNuclear symbolC atom with 6 protons and 6 neutrons. Write the nuclear symbol of C atom ……Mass number

15. 11B10BIsotopesAtoms of the same element (same Z) but different mass number (A).Boron-10 (10B) has 5 p and 5 n Boron-11 (11B) has 5 p and 6 n

16. Learning Check – Counting Naturally occurring carbon consists of three isotopes, 12C, 13C, and 14C. State the number of protons, neutrons, and electrons in each of these carbon atoms. 12C 13C 14C6 6 6 #p+ _______ _______ _______ #no _______ _______ _______ #e- _______ _______ _______666678666

17. Answers12C 13C 14C6 6 6#p+666#no678#e- 6 66