3344235
Descripción
Fichas por Dannie Couture, actualizado hace más de 1 año
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Creado por Dannie Couture
hace alrededor de 9 años
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| Pregunta | Respuesta |
| Atomic Number | Gives the number of: protons in the nucleus of an element and electrons around the nucleus |
| Atomic Mass | Gives the mass of the element and │ Atomic mass – Atomic number │= number of neutrons in the nucleus |
| Period | The rows of the periodic table The period number represents the number of electron shells the element will have |
| Group | The columns of the periodic table The group number represents the number of valence electrons the element will have |
| Alkali Metals | 1st column of the periodic table (except H) Possess 1 valence electron They are soft and highly reactive They must be stored in oil Never found in their pure state naturally |
| Alkaline Earth Metals | 2nd column of the periodic table Possess 2 valence electron THey make up the compounds of rocks Highly malleable and reactive Never found in their pure state naturally |
| Halogens | Before last column of the periodic table Possess 7 valence electron They are reactive They are known as salt creators Often used as cleaners or disinfectants |
| Noble Gases (or Inert gases) | Last column of the periodic table Possess 8 valence electron (except He which only has 2 valence electrons) They do not react because their electron shell is full They are found in their pure state naturally |
| Metals | Elements to the left of the periodic table (except Hydrogen) Usually shiny, ductile, malleable Often react with acids Good conductors of heat and electricity |
| Metalloids | 7 elements forming a "staircase" in the periodic table Semi-conductors Properties depend on conditions |
| Non-metals | Located to the right of the periodic table (including Hydrogen) Mostly gases Poor conductors of heat and electricity |
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