MC chpt. 5
Terms
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- The tiny negativley charged particles first described by Crookes is called
- Electrons
- The attraction of a rubbed comb for paper gives evidence that
- Matter is electrical in nature
- When two similarly charged objs are brought close together they
- repel each other
- An obj become pos charged when it
- has a deficiency of electrons
- The \"plum pudding\" model of the atom was proposed by
- Thomson
- The central portion of an atom is called the
- nucleus
- In a neutral atom, the numb of electrons is?
- equal to the numb of protons
- atoms of the same element that differ slightly in mass are called
- isotopes
- the diff in the mass of atoms of the same element are attributed to diff numbs of
- neutrons
- The particle generally not found in the nucleus of an atom is
- an electron
- an atom particle with a mass aprox. 1/1837 of a proton is
- an electron
- atomic number of an element indicates
- number of protons
- scientist who aranged the elements in the periodic table according to their atomic numbers is
- mosely
- The atomic mass of an atom is equal to the mass of the
- protons and neutrons
- at present, the element used as a standard for atomic mass is
- carbon
- When sodium metal is heated in a flame, the color of the flame becomes
- yellow
- the electron energy level closest to the nucleus of an atom is called the
- first level
- the max. number of electrons found in the first level of any atom is
- 2
- in the atom 23 11Na, the number of protons is
- 11
- of the following, the element that has an outermost level that is complete is
- neon
- to acheive stability when it combines with chlorine, a sodium atom will
- donate 1 electron
- an element that has fewer than 2 electrons in the first energy level is
- Hydrogen
- An element whos third energy level contains more than 8 electrons is
- scandium
- the element that normally has an equal number of protons and neutrons is
- Helium
- The symbol X- represents
- an ion