VS MILLIONAIRE!

1. VS MILLIONAIRE!

2. 234 Pu 94 • Look at the following isotopic notation: • What is the mass number? 234 • What is its atomic number? 94 • Is this a balanced atom or an isotope? isotope • How many neutrons are present in its nucleus? 140 • What is this isotope called? Plutonium 234 • In a balanced state, how many electrons does this element have? 94

3. Electron dot notation communicates what? The number of valence electrons Look at the following dot notation: Ar • How many valence electrons does this element have? 8 • Is this element stable or unstable? Very stable, it is a noble gas

4. When an atom has more or less electrons than it has protons it is called a(n) isotope • Atoms that have more electrons than protons are called ions. • Atoms that have more protons than electrons are called ____cations__________. • The weighted average of an element’s isotopes determine its atomic mass. • Electrons in the outermost energy level of an atom are called valence electrons.

5. Name the particles in an atom in order of least to most massive electron, proton, neutron. • The positively charged, central part of the atom is called the nucleus. • Go to the board and write the isotopic notation of tritium (mass # 3) (see p. 94) • The sum of the number of neutrons and the number of protons is called the atomic mass number. • What does the abbreviation Z stand for? Atomic number • What is Hund’s rule? As electrons fill sublevels, all sublevels will receive one before any receive two.

6. The Aufbauprinciple describes how electrons fill suborbitals (the high rise hotel analogy). • How does an isotope of an element differ from the balanced atom of the same element? It will have more or less neutrons than protons. • Go to the board and write the correct electron configuration for magnesium Z=12. 1s2 2s2 2p6 3s2