elements are diatomic molecules (molecules consisting of two atoms) or polyatomic molecules (which contain more than two atoms). We refer to the compounds composed of molecules as molecular compounds. When an atom gains one or more electrons it acquires a negative charge and is known as an ...
A molecule is the smallest amount of a compound: a substance made from two or more atoms. Some people find molecules and compounds confusing. Here's how to remember the difference. If you join two different chemical elements together, you can often make a completely new substance. Glue two...
Compound formed when two different elements join together. All compounds are molecules, but all molecules are not compounds. Ex. Water (H2O), carbon dioxide (CO2) and methane (CH4), Salt/sodium chloride (NaCl) Atomic Number how elements are grouped on the periodic table (smallest to biggest)...
and boron atoms Many substances are made up of different types of atoms. © Boardworks Ltd 2004 1 of 20 © Boardworks Ltd 2005 5 of 36 What is an element? All substances are made of very tiny particles called atoms. The elements are the simplest substances in the universe. ...
2. All atoms of a given element are identical, having the same size, mass and chemical properties. The atoms of one element are different from the atoms of all other elements. 3. Compounds are composed of atoms of more than one element. In any compound, the ratio of the numbers of ato...
Atoms, Molecules, Formula, and Subatomic (原子,分子,公式,亚原子).pdf,Atoms, Molecules, Formula, and Subatomic Particles Atoms Atoms are the immensely small particles of which all matter is composed. How small are atoms? They are so small that they
Elements and compounds pure substance General: AB A + B Decomposition(分解) A compound breaks down to form two or more substances copper(II) carbonate → copper oxide + carbon dioxide General: A + B AB Synthesis(化合) The substance is formed by the combination of two ...
2. All atoms of a given element are identical, having the same size, mass and chemical properties. The atoms of one element are different from the atoms of all other elements. 3. Compounds are composed of atoms of more than one element. In any compound, the ratio of the numbers of ato...
In 1816, Prout suggested that all of the heavier elements might have been built from the lightest element, hydrogen. Soon afterwards, Dalton stated that samples of different sizes of any particular chemical compound contained the constituent elements in the same proportions. He referred to the ...
numbersandtypesofatoms.•IV.Atomsareindestructible.Dalton’sAtomicTheory WhichofthefollowingstatementsregardingDalton’satomictheoryarestillbelievedtobetrue?•Elementsaremadeoftinyparticlescalledatoms.•Allatomsofagivenelementareidentical.•Agivencompoundalwayshasthesamerelative numbersandtypesofatoms.•IV....