Unit 6: Atoms and the Periodic Table

What is the atomic number of Carbon?

The 7 horizontal rows of the periodic table are called _______

Ancient Greek scientist who proposed there was a piece of a material so small it could not be broken. He named the atom.

The 18 vertical columns on the periodic table are called?

 Protons are positively charged particles flying around the outside of the nucleus at almost the speed of light.

Today - This model is based on the Bohr model, except that electrons orbit the nucleus in random paths within a region.

More than one element can have the same atomic number.

1904 - He proposed the "plum-pudding" model (like cookie dough): an atom is a solid mass of positively charged material

Electrons have a __________ charge.

1913 - He proposed that electrons move in different orbits, or energy levels, around the nucleus.

The atomic number of an element is the __________ .

The positively charged center of an atom is called the:

The sum of the protons and neutrons in an element is the atomic mass of the atom.

1911 - His experiments proved that atoms are mostly empty space. He discovered the nucleus.

The number of protons and electrons in an atom will be the same.

1800s - The first modern scientist to propose the existence of atoms. He described an atom as an invisible, solid sphere

Most of the elements on the periodic table  are _______.

What is the maximum number of electrons that the second energy level can hold?

K is the atomic symbol for what element?

A student of Rutherford's who found the neutron and that it was in the nucleus. Most people tend to forget him.

The number of protons and electrons in an atom will be the same.

The periodic table is organized by atomic #, the shells each element has, and how many electrons are on the outer shell.

Neutrons carry what type of charge?

 If a certain atom has 26 protons, 26 electrons, and 30 neutrons.  The atomic mass of this atom is