02.06 Periodic Table

Which of the following best describes a metal?

Malleable, shiny, and able to conduct heat or electricity

Zinc has the chemical symbol Zn and the atomic number 30. How many protons, neutrons, and electrons does an atom of zinc-69 have?

30 protons, 39 neutrons, 30 electrons

An atom has atomic number 5 and mass number 11. How many neutrons does the atom have?

6

Helium (He), oxygen (O), carbon (C) fluorine (F), and chlorine (Cl) are all nonmetals. Using the periodic table, which pair of nonmetals do you predict has the most similar properties, and why?

Fluorine and chlorine, because they are both halogens

The image shows the representation of an unknown element in the periodic table (10, Symbol, Name, 20.1797) Based on the representation, which of the following statements about the element is true?

The sum of the masses of protons and neutrons is 20.1797

Mendeleev's arrangement of elements in the periodic table was based on the observations and experiments of his predecessors who studied the mass and properties of elements.

true