CHEM 1205 CORE EXAMINATION ALL QUESTIONS
AND ANSWERS SURE A+
✔✔Building block elements - ✔✔O, C, H, N, compose 96% of the body
✔✔Atoms - ✔✔Building blocks of matter
✔✔Proton - ✔✔positively charged particle
✔✔Electron - ✔✔negatively charged particle
✔✔Neutron - ✔✔A small particle in the nucleus of the atom, with no electrical charge
✔✔Nucleus - ✔✔dense core containing protons and neutrons, most mass of an atom
✔✔electron cloud - ✔✔composed of electrons moving rapidly, comprises most of an
atoms volume
✔✔Atomic number (Z number) - ✔✔what represents the number of protons in the
nucleus of an atom= number of electrons
✔✔mass number (a) - ✔✔the number of protons (z)+ the number of neutrons
, ✔✔isotopes - ✔✔Atoms of the same element that have different numbers of neutrons
✔✔row - ✔✔period
✔✔column - ✔✔group
✔✔alkali metals - ✔✔group 1A elements
✔✔alkaline earth metals - ✔✔Group 2A elements
✔✔alkali metals - ✔✔soft, shiny, low mp, good conductors, react to form basic solutions
✔✔alkaline earth metals - ✔✔shiny, less reactive
✔✔Halogens - ✔✔Group 7A,
✔✔noble gases - ✔✔Group 8A, stable, rarely combine with other elements
✔✔the number of valence electrons = - ✔✔main group #
✔✔# of ve = - ✔✔dots in electron dot symbol
✔✔the size of atoms ____________ down a column - ✔✔increases
✔✔Cation - ✔✔A positively charged ion, fewer electrons than protons
✔✔the atomic number z - ✔✔the number of protons in the nucleus of an atom
✔✔the mass number A - ✔✔the total number of protons and neutrons in a nucleus.
✔✔isotope - ✔✔Atoms of the same element that have different numbers of neutrons
✔✔Radisotopes - ✔✔unstable, spontaneously emit energy to form more stable nucleus
✔✔ionic bond - ✔✔transfer of electrons from one atom to another
✔✔covalent bond - ✔✔sharing of electrons between 2 atoms
✔✔molecule - ✔✔two or more atoms held together by covalent bonds
✔✔when a metal and nonmetal combine, ___________ is formed - ✔✔ionic bond
AND ANSWERS SURE A+
✔✔Building block elements - ✔✔O, C, H, N, compose 96% of the body
✔✔Atoms - ✔✔Building blocks of matter
✔✔Proton - ✔✔positively charged particle
✔✔Electron - ✔✔negatively charged particle
✔✔Neutron - ✔✔A small particle in the nucleus of the atom, with no electrical charge
✔✔Nucleus - ✔✔dense core containing protons and neutrons, most mass of an atom
✔✔electron cloud - ✔✔composed of electrons moving rapidly, comprises most of an
atoms volume
✔✔Atomic number (Z number) - ✔✔what represents the number of protons in the
nucleus of an atom= number of electrons
✔✔mass number (a) - ✔✔the number of protons (z)+ the number of neutrons
, ✔✔isotopes - ✔✔Atoms of the same element that have different numbers of neutrons
✔✔row - ✔✔period
✔✔column - ✔✔group
✔✔alkali metals - ✔✔group 1A elements
✔✔alkaline earth metals - ✔✔Group 2A elements
✔✔alkali metals - ✔✔soft, shiny, low mp, good conductors, react to form basic solutions
✔✔alkaline earth metals - ✔✔shiny, less reactive
✔✔Halogens - ✔✔Group 7A,
✔✔noble gases - ✔✔Group 8A, stable, rarely combine with other elements
✔✔the number of valence electrons = - ✔✔main group #
✔✔# of ve = - ✔✔dots in electron dot symbol
✔✔the size of atoms ____________ down a column - ✔✔increases
✔✔Cation - ✔✔A positively charged ion, fewer electrons than protons
✔✔the atomic number z - ✔✔the number of protons in the nucleus of an atom
✔✔the mass number A - ✔✔the total number of protons and neutrons in a nucleus.
✔✔isotope - ✔✔Atoms of the same element that have different numbers of neutrons
✔✔Radisotopes - ✔✔unstable, spontaneously emit energy to form more stable nucleus
✔✔ionic bond - ✔✔transfer of electrons from one atom to another
✔✔covalent bond - ✔✔sharing of electrons between 2 atoms
✔✔molecule - ✔✔two or more atoms held together by covalent bonds
✔✔when a metal and nonmetal combine, ___________ is formed - ✔✔ionic bond
