Webalkaline-earth metal, any of the six chemical elements that comprise Group 2 (IIa) of the periodic table. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). Prior to the 19th century, substances that were nonmetallic, insoluble in water, and unchanged by fire were known as earths. Those … WebA 68.5-kg astronaut is doing a repair in space on the orbiting space station. She throws a 2.25-kg tool away from her at 3.20 m/s relative to the space station.
Chapter 2 Questions Flashcards Quizlet
WebOct 28, 2024 · Elements in the same period have: The same number of protons. Log in for more information. Question Asked by milaesha joana. Asked 10/28/2024 5:04:34 PM. … WebElements J and Z are part of groups next to each other in the same period. Elements J and Z are part of different groups in different periods. Question 5. 300 seconds. Q. Fluorine is classified as part of the halogen group because all the elements. answer choices. are conductors of electricity. have the same atomic mass. pyosik翻译
chemistry test 1: chapter 3 Flashcards Quizlet
WebAnswer. ll of the elements in a period have the same number of atomic orbitals. In other words they have the same number of valence electrons. View Answer. WebPeriodic Table of Elements Ch.2: Atoms and the Periodic Table Match each elemental symbol with the correct element name: Cl - chlorine - cobalt - calcium - chromium - copper - carbon Click the card to flip 👆 chlorine Click the card to flip 👆 1 / 65 Flashcards Learn Test Match Created by jdg520305 Terms in this set (65) WebThese elements have one electron in their outer energy level which makes them highly reactive. Alkali Earth Metals. These are the reactive metals located in group 2 of the periodic table. these elements have two electrons in their outer energy which makes them reactive with water and halogens. Atom. This is the basic building block of all matter. pyosalpinx vs hydrosalpinx ultrasound