Mass: 1 amu (atomic mass unit) Location: Nucleus Electrons... Charge: negative Mass: almost zero Location: electron clouds
Electrons vs Protons The electrons negative charge is the same size as a protons positive charge. They cancel each other out: +1 -1 = 0 Atoms like to have 0 charge.
Questions... What particles are in the nucleus? Explain why atoms are neutral. Why do scientists say that most of the mass of an atom is located in the nucleus?
How Do Atoms of Different Elements Differ? Lets compare a Hydrogen atom and a Helium atom
Hydrogen... Draw one proton. Draw a circle around the proton. Place one electron on the circle. You have just created a hydrogen atom! Hydrogen has no neutrons.
Helium Draw two protons and two neutrons all together. Draw an electron orbit around them. Place two electrons on the orbit. You have just created a helium atom!!!
What is different? The two different elements have different numbers of electrons, protons, and neutrons. OK...
Are all atoms of an element the same? Draw another Hydrogen atom, but this time add a neutron. It is still Hydrogen because it has only one proton, but it has more mass in the nucleus. It is called an isotope.
What is an Isotope? Isotope - atoms that have the same number of protons but have different numbers of neutrons. Some isotopes are radioactive. Otherwise they are mostly the
same as the regular atom. isotope from another? By their mass numbers. mass number = protons + neutrons.
Different isotopes will have different mass numbers because they have different numbers of neutrons. Lets see... Hydrogen-1
has 1 proton and 0 neutrons. Mass Number = 1 Hydrogen-2 has 1 proton and 1 neutron. Mass Number = 2 Questions List
the charge, location, and mass of each particle. Determine the number of protons, electrons, and neutrons in aluminum-27.
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In a small open economy, though, the interest rate cannot fall. So Y must rise to restore equilibrium in the money market. Intuition for the rezults: Initially, the increase in the money supply puts downward pressure on the interest rate....
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: the loss or gain of three non-basic jobs as a result of the loss or gain of one basic industry job. e.g. local auto manufacturing plant closes. 300 jobs are lost in the basic industry of auto manufacturing. 900...
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