It's in the cards discovering the periodic law lab answers
Asked by wiki @ in Chemistry viewed by 841 People
PLEASE HELP ME I BEG YOU I REALLY NEED HELP!!!!!!
Elements on the periodic table appear together in regions based on the energy sub-level that contains their outermost valence electrons. What are these regions called?
Mendeleev's periodic law has been restated to say that when the elements are arranged in order of increasing atomic number, there is a periodic pattern in their chemical and physical properties.
In 1894, William Ramsey discovered the first of several non-reactive elements. Which group of elements did Ramsey discover that would alter the structure of the periodic table?
the transition metals
the noble gases
the alkali metals
Which of the following elements is man-made?
What is the name of the group (family) that includes the elements radium, strontium, and magnesium?
alkaline earth metals
An element's atomic number is an indicator of its atom's:
number of protons
number of neutrons
An atom of oxygen contains 8 protons, 8 electrons, and 16 neutrons.
Which of the following is NOT true of electronegativity?
generally increases as atomic radius decreases within a period
generally decreases as atomic number increases within a period
generally decreases as the principal energy level increases within a group
generally increases as atomic radius decreases within a group
Which of the following elements possesses the most valence electrons?
How many dots should be drawn around the symbol, C, to create the Lewis dot structure for a carbon atom?
To achieve an octet in the valence energy level, a nitrogen atom will lose five electrons.
To achieve an octet in the valence energy level, a sulfur atom will become a cation.