Title: 🎒 science grade 8 lesson1 by fatema elfeky https://padlet.com/fatemafeky/3csys0r4lkdmkwab 1-What is the difference between Physical and chemical change of matter? en-us 2025-04-13 22:34:07 UTC 2025-10-27 13:59:25 UTC hello@padlet.com https://padlet.net/icons/8.0/svg/1f9d0.svg atomic number is the number of protons or electrons and the atomic mass the sum of protons and nuetrons https://padlet.com/fatemafeky/3csys0r4lkdmkwab/wish/3595652079 2025-09-21 09:57:44 UTC https://padlet.com/fatemafeky/3csys0r4lkdmkwab/wish/3595652079 Isotope is a element with same atomic mass and same atomic number https://padlet.com/fatemafeky/3csys0r4lkdmkwab/wish/3595652514 2025-09-21 09:58:43 UTC https://padlet.com/fatemafeky/3csys0r4lkdmkwab/wish/3595652514