Chemistry

• What is the atomic number of Ruthenium (Ru)?

  44
• What is the atomic number of Tantalum (Ta)?

  73
• What is the atomic number of Rhenium (Re)?

  75
• What is the atomic number of Polonium (Po)?

  84
• What is the atomic number of Francium (Fr)?

  87
• What is the atomic number of Radium (Ra)?

  88
• What is the atomic number of Actinium (Ac)?

  89
• What is the atomic number of Dubnium (Db)?

  105
• What is the atomic number of Seaborgium (Sg)?

  106
• What is the atomic number of Bohrium (Bh)?

  107
• What is the atomic number of Hassium (Hs)?

  108
• What is the atomic number of Meitnerium (Mt)?

  109
• What is the atomic number of Darmstadtium (Ds)?

  110
• What is the atomic number of Roentgenium (Rg)?

  111
• What is the significance of atomic numbers 112-116?

  They have been reported but not fully authenticated
• What are the atomic numbers of the Lanthanides?

  58-71
• What are the atomic numbers of the Actinides?

  90-103
• Why have relative atomic masses for Cu and Cl not been rounded?

  They have not been rounded to the nearest whole number
• What are the elements with atomic numbers 112-116?

  • Reported but not fully authenticated
  • Include elements like Copernicium and Livermorium
• What is the difference between Lanthanides and Actinides?

  • Lanthanides: Atomic numbers 58-71
  • Actinides: Atomic numbers 90-103
• What are atoms primarily made of?

  Atoms are made of protons, neutrons, and electrons
• What do many bonded atoms form?

  Many bonded atoms form matter
• How do atoms create variety in the universe?

  Atoms bond in different combinations
• What are the three sub-atomic particles?

  Protons, neutrons, and electrons
• Where do protons and neutrons reside in an atom?

  In the nucleus at the center of the atom
• What are the layers around the nucleus called?

  Electron shells or energy levels
• What is the outermost shell of an atom called?

  The outer electron shell
• How do protons and neutrons compare in size?

  They are considered the same size
• What does mass refer to in terms of matter?

  How much stuff something is made of
• How does density relate to mass?

  A small, dense object can have greater mass
• How much smaller is an electron compared to protons and neutrons?

  1/2000 the size
• What is charge associated with?

  Electrons and protons
• What charge do protons have?

  Positive charge
• What charge do electrons have?

  Negative charge
• What charge do neutrons have?

  No charge (neutral)
• How many different types of atoms are there approximately?

  Around 100 different types
• What is unique about each element?

  Each has a different name and symbol
• What do elements have that can vary?

  Different numbers of protons, neutrons, and electrons
• What do elements in the same group have in common?

  Similar characteristics and same outer shell electrons
• What is the group number for hydrogen?

  Group 1