Atoms are electrically neutral. A proton has a positive charge equal in magnitude to the negative charge of an electron. Atoms are electrically neutralBecause they contain equal numbers of protons and neutrons.. The mass of proton is 1836 times greater than the mass of an electron .. . Nuclear f
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1. Composition of the Atomic Nucleus All atomic nuclei are made of two kinds of particles, protons and neutrons.
2. Atoms are electrically neutral A proton has a positive charge equal in magnitude to the negative charge of an electron. Atoms are electrically neutral
Because they contain equal numbers of protons and neutrons.
3. The mass of proton is 1836 times greater than the mass of an electron .
4. Nuclear forces These short-range proton-neutron, proton-proton, and neutron-neutron forces hold the nuclear particles together and are referred to as nuclear forces.
5. Counting Atoms
6. Atomic number (z) Is the number of protons in the nucleus of each atom of that element.
Look at the periodic table
Ag silver atoms contain 47 protons
7. Atomic number = number of Protons
8. ISOTOPE Are atoms of the same element that have different masses.
9. The isotops of a particular element all have the same number of protons and electrons but different numbers of neutrons.
10. How many protons, electrons, and neutrons are there in an atom of chlorine -37?
11. Mass Number Is the total number of protons and neutrons in the nucleus of an isotope.
Table 3-2 page 76
12. Nuclide Is a general term for any isotope of any element.
Table 3-3 page 77
Answer question 3-1 on page 77