1. LIST&OF&TERMS& Displacement √ Chemical property √ Compounds √ Inner Valence shell √ Columns Physical property √ Ions √ Valence electron √ Electronegativity √ Single substance Reactivity √ Periods √ Valency √
2. Elements
2.1. Non-metals
2.2. Metals
2.3. have chemical properties
2.4. have physical properties
3. Periodic Table
3.1. consists of
3.1.1. elements arranged in columns and rows by increasing atomic number into
3.1.1.1. groups
3.1.1.1.1. elements in the same group have the same number of valence electrons in the valence shell and the same chemical properties
3.1.1.1.2. down the group, the ionization energy increases
3.1.1.1.3. down the group, number of shell increases
3.1.1.1.4. valency is determined by the group they are in
3.1.1.1.5. down the group, nuclear charge and screening increases and distance also increases, causing electronegativity to decrease
3.1.1.1.6. from observing displacement reactions, we can tell that reactivity decreases down the group for halogens
3.1.1.2. periods
3.1.1.2.1. across the period, the ionization energy decreases
3.1.1.2.2. across the period, they generally have the same number of shells
3.1.1.2.3. across the period, nuclear charge increases, while screening effect remains the same, causing electronegativity to increase
3.1.1.3. consist of
3.1.1.3.1. nucleus
3.1.1.3.2. electrons