do now (in your tracker) read the article and underline any words that you do not know. answer the...
TRANSCRIPT
Do Now (In your Tracker)
Read the article and underline any words that you do not know. Answer the following questions: 1. What is the main idea of the essay? 2. What conclusion did the author reach?
How do you know? 3. How does this relate to science?
Today’s Lesson Topic: Atomic Numbers and Isotopes!
Class Updates
Tutoring will be on Thursday this week NOT Tuesday.
The price of hot chips is now 10 energy bars
If you need to take the quiz make sure you do so—tutoring would be a great opportunity to do so!
Today’s Objective:
SWBAT characterize and classify elements based on their atomic structure.
Essential Question: how can elements with different number of neutrons be similar?
Atomic Number (Z):
• is the number of protons in the nucleus of the atom. Z=#p• The number of protons (atomic number) determine the identity of an element.
What about the electrons? How many?
• Atoms have no overall electrical charge so, an atom must have as many electrons as there are protons in its nucleus. • # p =# e•The atomic number of an element also equals the number of electrons in a neutral atom of that element• Z =#e
Ex: Sodium
What is the atomic number of Sodium?
How many protons does sodium have?
How many electrons does sodium have? 11
11
11
Isotopes
They have different mass numbers
because they have
different numbers of neutrons,
but they have
the same atomic number because they have the same number of protons.
Atoms of the same element with
• Same number of protons
• Same number of electrons
• Different number of neutrons
Isotopes
Do isotopes have similar chemical properties? Why?
Yes – electrons are the same Do they have similar physical
properties? Why? NO – mass is different.
Example:Isotopes of Carbon and Hydrogen
protium deuterium tritium H H H
Isotopes of Carbon
Isotopes of Hydrogen