List the seven diatomic elements. Give their names and symbols.

An element has the following natural abundances and isotopic masses: 78.99% abundance with 23.985 amu, 10.00% abundance with 24.986 amu, and 11.01% abundance with 25.983 amu. Calculate the weighted average atomic mass of this element. Use the correct number of significant figures in your answer. Identify the element, by name and symbol.

Write a complete chemical formula, including physical state symbol, for each element listed below in its standard state. The first row of the table has been completed for you. element iron carbon hydrogen krypton I Don't Know formula Fe(s) 0 Submit X 00 $ S n Stv © 2023 McGraw Hill LLC. All Rights R 9 A Ⓒ J

In the table below, there are descriptions of an experiment on samples of three different chemical elements. Decide whether the element is a metal or nonmetal, if you can. If there is not enough information to decide, choose can't decide in the third column. element description metal or nonmetal? Element 1 is a hard silvery-gray solid. Wires are fastened to each side of a 2 cm slab of it, and an ordinary household 9 V battery is hooked up so that it can feed electricity through the slab to an LED. The LED glows brightly. metal 1 nonmetal (can't decide) Element 2 is a moderately soft silvery-gray solid. A 5 cm × 5 cm square of it, only 1 mm thick, is pressed into a dish-shaped mold under high pressure. When the press is lifted up, the sample has been crushed to a powder. metal 2 nonmetal (can't decide) metal Element 3 is a moderately soft silvery-gray solid. A 5 cm x 5 cm square of it, only 1 mm thick, is twisted using two pairs of pliers, giving it a slight curve. 3 nonmetal (can't…