Chapter 11 Lesson 1
What is true about elements in the same group?
All elements in a group have similar chemical properties
In the mid-1800s, Russian chemist and teacher created a table to help classify the elements by their properties. What is his name?
Dimitri Mendeleev
In the early 1900s, Henry Moseley found that the problem with Mendeleev's table could be solved if the elements were arranged in rows by _______ .
atomic number
What increases as you read left to right across each period?
atomic number
number of protons in the nucleus of each of that element's atoms
atomic number
Elements in the same group have similar _________which means they react with other elements in similar ways.
chemical properties
The ________shows the element's name, atomic number, chemical symbol, state of matter, and atomic mass.
element key
shows chemical symbol, atomic number, and atomic mass
element key
The periodic table can be used to determine how all ______ are related to one another
elements
A ________is a column on the periodic table.
group
only nonmetal not located on left side of the periodic table
hydrogen
As you read from left to right across the periodic table, atomic number ________by one for each element.
increases
What is used to create the sequential order of elements?
increasing atomic number
Periodic table
is a chart of the elements arranged into rows and columns according to their chemical and physical properties
Dimitri Mendeleev placed the elements in rows of increasing atomic_____
mass
For example, Mendeleev noticed patterns in the _______ of elements, the temperature at which a solid changes to a liquid.
melting point
increase, then decrease across a period
melting point
What are between metals and nonmetals on the table?
metalloids
between metals and nonmetals on the periodic table
metalloids
Most of the elements in the periodic table are ______ , which are shiny and conduct thermal energy and electricity
metals
on the left side and in the middle of the periodic table
metals
Between the metals and nonmetals on the periodic table are the_______ which have properties of metals and nonmetals.
metealloids
Elements that are ______each other on the periodic table share similar properties
near
After arranging the known elements in a periodic table, Mendeleev noticed large gaps between some elements. He predicted that scientists would find _______ to fit into these spaces. Mendeleev's predictions were _________
new elements, correct
on the right side of the periodic table
nonmetals
Where are nonmetals on the table?
on the right side
The elements in the table showed repeating patterns; _____ is a word used to describe such patterns.
periodic
chart of elements arranged according to their properties
periodic table
The rows in the periodic table are called
periods
You can identify the properties of an element by studying its ________ on the periodic table.
placement
Scientists use the periodic table to predict the ______of the new elements they create.
properties
The atomic number is the number of _____ in the nucleus of an atom of an element.
protons
Most nonmetals are on the ________side of the periodic table; these elements do not conduct thermal energy and electricity.
right
latest elements added to the periodic table
synthetic elements
What is true about the characteristics of elements in a period from left to right on the periodic table?
they change in physical and chemical properties
Where are metals on the table?
to the left side of the table and in the middle
