Modern Periodic Table

• Who was Dmitri Mendeleev?

  A Russian chemist and inventor
• What did Mendeleev devise in the mid-nineteenth century?

  The periodic table of elements
• What does the periodic table organize?

  All known elements
• What did Mendeleev's periodic table predict?

  New elements not yet discovered
• How are elements arranged in the periodic table?

  By increasing atomic number
• What does the atomic number represent?

  The number of protons in an atom
• What is found within each box of the periodic table?

  The nucleus symbol for that element
• What is the elemental symbol for sodium?

  Na
• What does the atomic number indicate?

  How many protons an atom has
• What does the mass number tell us?

  Total number of protons and neutrons
• What pattern did Mendeleev observe in the elements?

  Chemical properties repeated at regular intervals
• What are the horizontal rows in the periodic table called?

  Periods
• What do the vertical columns in the periodic table represent?

  Groups with similar chemical properties
• How many groups are there in the periodic table?

  Seven
• What is unique about Group 0?

  It is called Group 0, not Group 8
• Why do elements in the same group have similar properties?

  They have the same number of outer electrons
• How many electrons do Group 2 elements have in their outer shell?

  Two electrons
• What do all Group 1 elements have in common?

  One electron in their outer shell
• How do Group 1 elements react with water?

  They react violently
• What trend is observed in Group 1 elements as you move down the group?

  They become more reactive
• What do Group 7 elements have in common?

  Seven electrons in their outer shell
• How does reactivity change in Group 7 elements as you move down the group?

  They become less reactive
• What are Group 0 elements known as?

  Noble gases
• What is unique about the outer shells of noble gases?

  They have full outer shells
• How many electrons does argon have in its outer shell?

  Eight out of eight
• How many electrons does helium have in its outer shell?

  Two out of two
• Why are noble gases unreactive?

  They do not need to gain or lose electrons
• What does the zigzag line in the periodic table separate?

  Metals from nonmetals
• What are the elements in the middle of metals called?

  Transition metals
• What should you do if you see different types of periodic tables online?

  Understand they present the same information
• How can you identify the atomic number in a periodic table?

  It is the smaller of the two numbers
• What will the periodic table provided in an exam resemble?

  It will be similar to the one used in the video
• What should you do if you enjoyed the video?

  Like and subscribe