Periodic Table Challenge

All elements in a period have the same number of electron shells.

Each next element in a period is less metallic than its predecessor.

Elements in the same group have similar chemical and physical properties, reflecting the periodic law.

<p>The halogens, found in group 17, share properties such as high reactivity and the tendency to gain one electron.</p> Signup and view all the answers

<p>Modern quantum mechanics explains these trends in terms of electron shells filling with electrons in a specific order.</p> Signup and view all the answers

<p>The periodic table is an organizing icon of chemistry and is widely used in physics and other sciences. It arranges the chemical elements into rows and columns based on their atomic numbers and shows the recurrence of their properties.</p> Signup and view all the answers

<p>The periodic table is divided into four roughly rectangular areas called blocks.</p> Signup and view all the answers

<p>The metallic character increases going down a group and decreases from left to right across a period.</p> Signup and view all the answers

<p>The nonmetallic character increases as you move from the bottom left to the top right of the periodic table.</p> Signup and view all the answers

<p>The first generally accepted periodic table was formulated by the Russian chemist Dmitri Mendeleev in 1869.</p> Signup and view all the answers