Periodic Table

What is the 79th element on the periodic table?

In the early 1900s,arranged the elements by increasing atomic number

There are ____ vertical columns called groups

group 1 - reactive with water, and only one electron in the outer energy level

Nuclear scientists smash existing elements with particles to create synthetic elements

What is the 26th element on the periodic table?

non-metals consist of:

In the 1800s,arranged the elements in order by increasing atomic mass

Transuranuim elements have more than 92 protons

matter that is composed of one type of atom

All elements are classified as one of three types:

 repeated ina pattern ex: moon, tides

There are _____ horizontal rows called periods

Except for transuranium and promethium, each synthetic element has more than 92 protons

metals consist of:

group 18 - Not reactive Have a full outer shell (8 electrons)

group 1 - reactive with water, and only one electron in the outer energy level

metalloids consist of:

transition elements

group 2 - Reactive Have 2 electrons in the outermost shell

What is the 30th element on the periodic table?

is americium is used to detect smoke in smoke detectors?

What is the 19th element on the periodic table?

actinides

group 17 - Reactive Lack 1 electron to have a complete outer shell 

hydrogen is the second element on the periodic table

lanthanides

are electrons in the outermost energy level