3 Periodic Trends

Question 1

Periods and Groups

Answer 1

Periods are rows and elements in the same period have the same number of electrons in valence shell
Groups are columns and elements in the same columns have their valence shells at the same energy level (n). Elements in the same group have similar chemical properties.

Question 2

Explain how the periodic table is ordered.

Answer 2

The elements are ordered in increasing atomic number (protons)
The period number shows the outer energy level that is occupied by electrons
The group number show the number of electrons in the outer shell.

Question 3

Learn electroni configuration from periodic table

Answer 3

revisar libreta

Question 4

Alkali metals

Answer 4

Group 1. The most reactive group of metals. React strongly with water.

Question 5

Alkaline earth metals

Answer 5

Group 2. Reactive metals but less than Alkali metals.

Question 6

Halogens

Answer 6

Group 17. The most reactive group of non-metals.

Question 7

Noble Gases

Answer 7

Group 18. Very unreactive gases

Question 8

Transition metals

Answer 8

D-block. Relatively stable metals with moderate reactivity. Useful for construction.