HNHS: Atoms & the Periodic Table 2

Which of the following is NOT found in the nucleus of an atom?

The sum of the number of protons and neutrons in an atom.

The periodic table is organized into columns called _____.

Elements that have some properties of both metals and nonmetals.

Particles that make up protons & neutrons

Hydrogen-1 has ____ neutrons.

A certain element has 26 protons, 26 electrons, and 30 neutrons. It's mass number is _____.

Each energy level of an atom has a maximum number of _____ it can hold.

The element nickel has five naturally occuring isotopes. Which of the following describes them.

The positively charged center of an atom.

Horizontal row in the periodic table

Which group of elements on the periodic table is unreactive?

What particle identifies each particular element?

Poor conductors of heat and electricity

Most of the elements to the left on the periodic table exist as _____ at room temp.

What is the term for a repeating pattern?

The weighted-average mass of all the known isotopes for an element.

Arranged elements in rows based on increasing atomic mass & columns based on similar properties

A diagram showing only outer energy level electrons

2 elements with the same number of protons but a different number of neutrons