KS3 PERIODIC TABLE

• How are elements arranged in the periodic table?

  By atomic number and mass number
• What is the basic structure of the periodic table of elements?

  It organizes elements by their properties
• What happens to atomic numbers as you move left to right in the periodic table?

  They increase in size
• How many atoms make up everything on Earth?

  Around a hundred atoms
• What do the vertical columns in the periodic table represent?

  Groups of elements
• What are the two main types of elements in the periodic table?

  Metals and nonmetals
• What are the first three elements in group one of the periodic table?

  Lithium, sodium, potassium
• How are metals and nonmetals separated in the periodic table?

  By a red zigzag line
• How many electrons do elements in group one have in their outer shell?

  One electron
• What are the columns of the periodic table called?

  Groups
• What do elements in the same group share?

  Similar properties
• Why are elements in group one organized together?

  They all react the same way with chemicals
• What is the name of Group 1 in the periodic table?

  Alkali metals
• How many electrons do elements in group two have in their outer shell?

  Two electrons
• What is the name of Group 2 in the periodic table?

  Alkali earth metals
• What is true about the reactivity of group two elements?

  They react in the same way with chemicals
• What is the name of Group 7 in the periodic table?

  Halogens
• How many electrons do elements in group three have in their outer shell?

  Three electrons
• What is the name of Group 0 in the periodic table?

  Noble gases
• What is the pattern for the number of outer shell electrons in groups of the periodic table?

  It increases by one for each group
• What is the central block of the periodic table called?

  Transition metals
• What are the rows of the periodic table called?

  Periods
• What do the elements in group zero have in their outer shell?

  A completely filled outer shell
• What happens to the properties of elements as you move across a period?

  Patterns in properties emerge
• Why do elements in group zero not react with other chemicals?

  They have filled outer shells of electrons
• What is the first period called?

  Period one
• How many electrons does helium have in its outer shell?

  Two electrons
• What is the reactivity trend in Group 1 as you go down?

  Reactivity increases
• How many electrons do neon and argon have in their outer shells?

  Eight electrons
• What is the significance of the outer shell being filled for group zero elements?

  It indicates they are chemically inert
• What happens to melting and boiling points in Group 1 as you go down?

  Melting and boiling points decrease
• How do alkali metals react with water?

  They react vigorously
• What is the general equation for alkali metal reactions with water?

  Metal + water → metal hydroxide + hydrogen
• What is produced when lithium reacts with water?

  Lithium hydroxide and hydrogen
• What is produced when sodium reacts with water?

  Sodium hydroxide and hydrogen
• What are the halogens known for?

  They are colorful elements
• How does the color of halogens change down the group?

  Colors darken as you go down
• What states are fluorine and chlorine at room temperature?

  Gases
• What state is bromine at room temperature?

  Liquid
• What states are iodine and astatine at room temperature?

  Solids