![]() How many electrons does it have? Answer: Calcium has _ electrons.ġ8 Question # 2 Sulfur has an atomic # of 16 and an atomic mass of 32. How many protons does it have? Hydrogen has 1 proton.ġ7 Question # 1 Find the element Calcium (Family 2, Period 4) on your periodic table. For Example: Hydrogen’s atomic number is 1. Answer the questions on your own paper in a complete sentence. 40 (atomic mass rounded) - 20 (atomic number) 20 neutronsġ4 Noble Gases: inert -meaning they don’t combine with other elements because their outer electron level is filled last family see highlighted He Ne Ar Kr Xe Rnġ5 Valence: number of electrons in outer shell (cloud level)ĭirections: Read the following questions. The atomic mass is and the Atomic number is 20. For example look at Calcium on the Periodic Table. Atoms have the equal amounts of protons and electrons, therefore the atomic number is both the number of protons and electrons.ġ3 Neutrons To find the number of neutrons of an element on the Periodic Table you take the atomic mass and round it (if needed greater than >.5) and subtract the atomic number. ![]() ![]() The atomic mass is the number found below the element symbol.ġ2 Electrons To find the number of electrons on the periodic table look at the atomic number. The atomic mass is the weighted average mass of the isotopes of an element. For example two types of chlorine atoms are chlorine-35 and chlorine-37ġ1 Atomic Mass An atom’s mass number is the number of protons plus the number of neutrons it contains. They are called Isotopes – atoms of the same element that have different numbers of neutrons. For example Chlorine atoms have 18 neutrons in their nucleus while others have 20. However, the number of neutrons can vary for on element. What is the number of protons for the elements C _, Ne _, Pb _, and U _.ġ0 Chlorine Isotopes Although the number of protons changes form element to element, every atom of the same element has the same number of protons. So every atom of chlorine has 17 protons in its nucleus. It tells you the number of protons in the nucleus of each atom of that element. The top number 17 is the element’s atomic number. Electrons are scattered in the mostly empty space around the nucleus call the Electron Cloud.Ĭhlorine Identifying Characteristic of Elements Look up the element Chlorine on the Periodic Table of elements. Electrons are invisible, negatively charged particles. Neutrons are the uncharged particles in the nucleus. Protons are the positively charged particles IN the nucleus. carbonĨ All atoms consist of: Nucleus is the positively charged, central part of the atom. Atoms are so small that it would take 1 million of them lined up in a row to equal the thickness of a human hair. Non metal some a gas metals/solids metalloids lanthanide actinideĢ Metals malleable (bendable), shiny, and good conductors of electricityģ Nonmetals brittle (breaks easy), dull, and poor conductors of electricityĤ Metalloids similar properties to both metals and nonmetalsĥ Families or Groups have: similar properties and behaviors, located in vertical columns, example-highlighted area is a family or group H Li Na K Rb CsĦ Rows or Periods: atomic number increases as move right ending with a noble gas, every element has same number of core electrons, ex row 2 all have 2 electrons on 1st energy level Li 2 Li Be B C N O F NeĮlement is matter made up only one kind of atom.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |