Sci test 6\9\23 Flashcards
True or False - heat and electricity can easily float through metals
True
True or False - tracers can be used to follow the steps of a chemical reaction
True
True or False - Non metals can be hammered into thin sheets.
False
True or False - it is impossible to predict the properties of an element by its position on the periodic table.
False
True or False - In an atoms the number of protons is equal to the number of electrons
True
The most reactive metals found on the periodic table are ______.
Alaki
The most reactive group of nonmetals whose atoms gain or share one electron in chemical reaction is the _____.
Halogence
The spontaneous emission of radiation by an unstable atomic nucleus is called _________.
Radioactive
The average mass of all isotopes of an element is called the elements ______.
Atomic mass
Atoms with the same number of protons but different number of neutrons are called _______.
Isotopes
_______ and ______ are found in the nucleus of an atom. Protons and neutrons
Protons and nuetrons
Scientists make elements heavier than uranium in machines called particles _______.
Accelerators
The number of protons in an atom is the element’s atomic ______
Number
When metal atoms react with the atoms of other elements the metal atom loose ______.
Electrons
Dimiti mendeleeve created the ________.
Periodic table
