The _ of each element have a characteristic number of _ arranged in _. The number of _ determines what types of bonds or ions th
e atoms may form, so the chemical reactivity of an atom arises from its _. The properties of compounds emerge from the arrangement of their constituent atoms and of the bonds between them. Thus, a wide variety of _ with very different chemical properties can be made from the same _. Each molecule has a distinctive size, shape, and _, which determine its highly specific ability to _. Compounds in chemical wastes may contaminate the environment if their atoms are combined in new arrangements that _. Word bank:
atoms
Molecules
Harm living organisms
Valence electrons
Charge distribution
Electron distribution
Interact with other molecules electron shells
Electrons
Basic atoms
Atoms are composed of electrons. These electrons are arranged in shells. The number of valence electrons (outermost shell electrons) determine the kind of bonds that can be formed in a molecule.
In a molecule, charges are distributed in a unique way and the charge distribution in a molecule determines how the molecule interacts with other molecules. Different molecules can be made by arranging the same basic atoms in different ways.
Harmful substances can be formed when atoms of elements combine in new ways in the environment.
After pollination and fertilization following changes occur in a flower: The petals, stamens, style and stigma of the flower fall off. Sepals dry up and hold the ovary. The ovules confined in the ovary develop into seed
Prokaryotes were the first forms of life on Earth long before simple multicellular life appeared because of their ability to withstand extreme conditions. It is believed that the first living forms were bacteria combined with archaea in the microbial mat (multi-layered sheet).
