![]() ![]() To find the valence electrons, look at the group number. If the atom is neutral, the atomic number is equal to the number of electrons. and valence electrons as V.E.ġ7 Determining the Core and Valence Electrons in an Atom To find the total number of electrons, look at the atomic number. If you are using a notebook Make a bullet point that says Determine Core and Valence Electrons As you complete the questions, write the name of each element and the number of core and valence electrons You may abbreviate core electrons as C.E. Elements in group 8A have 8* valence electrons.ġ6 Let s Practice Determining the Core and Valence Electrons in an Atom If you are using the guided notes, answer the questions on your handout. Elements in group 7A have 7 valence electrons. Elements in group 6A have 6 valence electrons. Elements in group 5A have 5 valence electrons. Elements in group 4A have 4 valence electrons. Elements in group 3A have 3 valence electrons. Elements in group 2A have 2 valence electrons. Please label the main group elements on your Periodic Table we color coded in our previous lesson.ġ1 Elements in group 1A have 1 valence electron. We labeled our Periodic Table with groups The main group elements can also be labeled 1A, 2A, 3A, etc. The group number of an element tells us how many valence electrons an atom in that group will have. Valence electrons participate in chemical bonding.ġ0 Calculating the number of valence electrons. Valence electrons: electrons contained in the outermost shell. These electrons do not participate in chemical bonding. Core electrons: electrons contained within the inner shells of an atom. Valence Electrons Most atoms have core and valence electrons. The atomic number is 29 so there are 29 electrons 29 Cu Copper If a Copper atom has a mass number of 64, how many neutrons does it have? 35 neutronsĩ Core vs. How many electrons does a neutral atom of Copper have? A Copper atom has 29 electrons. The atomic number is 29 so there are 29 protons 5. How many protons does a Copper atom have? A Copper atom has 29 protons. What is the atomic mass of Copper? amu 4. Atomic mass units are VERY small!ħ Bellwork 3. ![]() What are the units for atomic mass? The units for atomic mass are atomic mass units. Mass number is the sum of the protons and neutrons in an atom. The atomic mass is measured in atomic mass units. What is the difference between atomic mass and mass number? Atomic mass is a weighted average of the mass numbers of all naturally occurring isotopes for that element (isotopes have different numbers of a neutrons). If a Copper atom has a mass number of 64, how many neutrons does it have?Ħ Bellwork 1. How many electrons does a neutral atom of Copper have? 6. How many protons does a Copper atom have? 5. What is the difference between atomic mass and mass number? 2. If the question requires a calculation, make sure you show all of your work. ![]()
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