Modern Periodic Table

• Who was Dmitri Mendeleev?

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

  He devised the periodic table
• What does the periodic table organize?

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

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

  In order of increasing atomic number
• What does the atomic number represent?

  The number of protons in the atoms of that element
• What is contained 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 tell us?

  How many protons the atoms of that element have
• What does the mass number indicate?

  The total number of protons and neutrons in that atom
• What pattern did Mendeleev observe while organizing the periodic table?

  The elements displayed a pattern of chemical properties that repeated at regular intervals
• What do we call the new row formed in the periodic table when a pattern repeats?

  Periods
• What do the elements in each vertical column of the periodic table have in common?

  They have similar chemical properties
• What is the term used for the vertical columns in the periodic table?

  Groups
• How many groups are there in the periodic table?

  Seven
• What is the exception regarding the naming of the far-right group in the periodic table?

  It is called group 0 rather than group 8
• Why do elements in each group have similar chemical properties?

  They have the same number of electrons in their outermost shell
• What does the group number indicate about the elements?

  How many electrons they have in their outer shell
• How many electrons do elements in group two have in their outermost shell?

  Two electrons
• What are the group one elements called?

  Alkali metals
• What do all group one elements have in common regarding their outer shell?

  They all have one electron in the outer shell
• How do group one elements react with water?

  They react violently with water
• What trend is observed in group one elements as you move down the group?

  They become more reactive
• What are group seven elements called?

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

  Seven electrons
• What trend is observed in group seven elements as you move down the group?

  They become less reactive
• What are the group zero elements known as?

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

  They all 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 considered unreactive?

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

  The metals from the nonmetals
• What is the special block of elements in the middle of the metals called?

  Transition metals
• What should you remember about different types of periodic tables you might find online?

  They present the same information in slightly different ways
• How can you identify the atomic number in a periodic table?

  It will be the smaller of the two numbers
• What will the periodic table provided in an exam be similar to?

  The one used throughout the video
• What should you do if you enjoyed the video?

  Give it a like and subscribe