Periodic Trends

Who created the periodic table format that is still used today?

• Albert Einstein

• Niels Bohr

• Dmitri Mendeleev

• JJ Thomson

Periods are

(a)  

Groups are

(a)  

The elements classification that separates the metal and nonmetals on the periodic table are called​ (a)  

• metalloids
• halogens
• alkali metals
• transition metals

Valence electrons are

• the total number of electrons in a neutral atom

• the number of electrons in a positively charged ion

• the number of electrons in a positively charged ion

• the number of electrons in the outermost energy level

Atomic radius INCREASES down a group because

• there are more electrons

• there are more protons, neutrons and electrons

• there are more energy levels

• there are more protons and electrons

Atomic radius ______________ across a group because

• INCREASES; there are more protons and electrons, creating a stronger force of attraction

• DECREASES; there are more protons and electrons, creating a stronger force of attraction

• INCREASES; there are more protons, neutrons and electrons

• DECREASES; there are more energy levels

Ionization energy is

• energy needed to remove an electron in the outermost energy level

• energy needed to remove an electron in the innermost energy level

• energy needed to attract an electron to the outermost energy level

• energy needed to attract an electron to the outermost energy level

Ionization energy _____________ for elements that have a smaller atomic radius.

• is higher

• is lower

• doesn't change

Ionization energy is lower for larger atoms because

• there is more attraction for an electron to the nucleus since the valence electrons are closer

• there is less attraction for an electron to the nucleus since the valence electrons are farther away

• there are more protons

• there are more electrons