Mendeleev made an early periodic table. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic structures model how electrons are arranged in atoms.
Which scientist developed an early periodic table?
J J Thomson
How are the elements of a period arranged in the modern periodic table, from left to right?
In order of increasing atomic mass
In order of increasing atomic number
In order of decreasing atomic mass
Which element is in group 2 and period 3 of the periodic table?
What is the electronic structure of an atom of the element whose atomic number is 13?
An atom of an element has the electronic structure 2,8,8,2. What is its atomic number?
An atom of an element has the electronic structure 2,8,7. Which group of the periodic table is it in?
An atom of an element has the electronic structure 2,8,8,1. How many electrons are in the shell nearest the nucleus?
Which of these properties does a typical non-metal element have?
It is a good conductor of heat
It has a high density
It is a poor conductor of electricity
What happens to metal atoms in chemical reactions?
They lose electrons to form positive ions
They gain electrons to form negative ions
They lose electrons to form negative ions
Which statement about metals and non-metals in the periodic table is true?
There are more non-metal elements than metal elements
Metals are on the left of the stepped line, and non-metals are on the right of the stepped line
Metals are on the right of the stepped line, and non-metals are on the left of the stepped line