 Which particles in atoms have a negative electric charge?

 Fluorine, chlorine, bromine, and iodine are part of a family called____________?

 This property of a metal means that it can be pulled out, or drawn, into a long wire.

 This element makes up 78 % of the atmosphere.

 To make most synthetic elements, scientists use powerful machines called____________?

 Mendeleev created the first periodic table by arranging elements in order of increasing ___________?

 Which group contains the most elements?

 This noble gas has two electrons

 The sun is made up mostly of the element ________?

 The elements in a row of the periodic table are said to be in the same ____________?

 This element acts like an alkali metal but only has one electron

 Which scientist showed that most of the mass and positive charge of an atom is concentrated in its center?

 This element is head of the Caron family and known as the basis of life

 An atom that gains or loses one or more electrons is called an __________?

 Scientists use the periodic table to predict the ______________of the new elements they create.

 This classification of elements fall between the metals and non- metals.

 The orbits of electrons are called ___________?

 This is the only type of radioactive decay where no new element is formed

 Thomson used a cathode tube “ray gun” to discover this atomic particle

 This layer of the atmosphere is named because incoming energy from the Sun strips off electrons from Nitrogen and Oxygen.

 When you change the number of protons in the nucleus you, you get a ____________?

 A ______ sometimes conducts electricity like a metal and sometimes blocks the flow of electricity like a nonmetal.

 He is known as the father of the atomic theory.

 When you change the number of neutrons in the nucleus, you get a __________________?

 These elements that are inert are called _______________?

 Reactions that release heat or light or both are called ______________?

 The Rows on the periodic table are called ________________?

 A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is ____.

 What information in the periodic table indicates the number of protons in an atom?

 Most of the elements on the periodic table can be classified as ______________?

 This property describes the way a metal reflects light.

 There are four particle released during _________ radioactive decay

 This French couple earned two noble prizes for their work in radiation.