Chapter 4 Elements and the Periodic Table

Who discovered radioactive decay while studying a mineral that contained uranium.

A positively charged particle in an atom's nucleus

Model of an atom with nucleus of protons and neutrons with electrons in the outer shells

Who created the first periodic table

40.07 is the ________for Ca.

Elements in the periodic table are arranged in order of decreasing atomic # from left to right.

How many protons in Ca?

What is shown at the bottom of the periodic table in order to keep the table compact?

Elements in the periodic table are arranged in order of decreasing mass from left to right.

A radioactive isotope that can be followed through a chemical reaction or industrial process.

Moving left to right across the periodic table, the reactivity of the metal elements __________

Group of mostly nonmetals on the periodic table that is very reactive that share/gain 1 e-

The atomic mass unit (AMU) is about the mass of a ____________.

An element shares properties with other elements in same _________

If a substance can be pulled or drawn into a wire it is

What shows the number of protons in an element?

An elements properties can be predicted from

Choose the following that are characteristics of most metals.

The spontaneous emission of radiation from an unstable atomic nucleus is called

True or false: Metals are good conductors of heat and electricity.

Molecule that consists of two nonmetal atoms bonded together.

Has properties of both metals and nonmetals.

The particles that are lost, gained, or shared in chemical reactions are

The model of an atom as ball of + charges with - charged electrons embedded in it.

To find the number of neutrons in an element _______________.

The most reactive group of metals in the periodic table