atoms & elements

• what is the relative charge of a neutron?

  0
• what is the relative mass of a proton?

  1
• what is the relative mass of a neutron?

  1
• what is the relative mass of an electron?

  very small
• what is the relative charge of a proton?

  +1
• what is the relative charge of an electron?


  -1
• what is it meant by isotopes?

  isotopes are different forms of the same element, which have the same number of protons but a different number of neutrons.
• true or false? most of the mass of an atom is located in the nucleus

  true. electrons have virtually no mass
• why do atoms have no charge?


  atoms have the same number of protons and electrons. because the charges on protons and electrons are opposite and equally sized. they cancel each other out.
• how do u work out number of neutrons?


  number of neutrons = mass number - atomic number
• name the parts of a nuclear symbol.

  .

  A) mass number

  B) atomic number

  C) chemical symbol

  
• what is an element?

  a pure substance made up of only one type of atom. cannot be broken down any further.
• which 4 elements make up 96% of the body?

  Oxygen, carbon, hydrogen, nitrogen

  A) oxygen

  B) carbon

  C) hydrogen

  D) nitrogen

  
• what does the atomic number represent?


  The number of protons in an atom's nucleus.
• what does the mass number represent?

  The total number of protons and neutrons in an atom's nucleus. ( total mass of atom )
• why is the relative atomic mass of chlorine not a whole number?

  chlorine has more than one isotope.
• what is relative atomic mass?

  relative atomic mass is an average that takes into account the different masses and abundances of all the isotopes that make up an element.