Science periodic table am
Which is a property of a neutron?
0 charge
What is the number of protons in an atom of sodium?
11
The atomic number of magnesium is 12. Its nucleus must contain ?
12 protons and no electrons.
Identify the number of neutrons in one atom of sulfur with an isotopic mass number of 34 am?
18
all alkali metals have - electrons
2
As you move from row ______ to row ______ in the periodic table, the atomic radius of the elements DECREASES.
7 to 1
An atom of potassium has one valence electron. If this electron is removed from the atom, what has been created?
A positively charged ion
Which of these alkali metals has the largest atomic radius?
Fr
column of elements in the periodic table are called ?
Group
nonmetal IN THE GROUP 17 OF THE PERIODIC TABLE ARE CALLED?
Halogen
elements in group 18 of the periodic table are called?
Noble Gasses
Jose and Eric were given four samples in lab. The results of their analysis are shown in the table. Based on the data they collected, which sample is most likely a metal?
Sample C
What element behaves MOST like magnesium?
Sr
Both protons and neutrons are located inside the nucleus of an atom. Changing the number of neutrons in the nucleus would form different isotopes of the same element. Which of these BEST describes the outcome of decreasing the number of protons in the nucleus?
The atom would become a different element
Elements in the same group/family of the periodic table are similar in what way?
They have the same number of valence electrons.
Alkali metals are found only in compounds
True
radioactive transition metals are called?
actinide
metal in group 2 of the periodic table are called?
alkali earth metals
halogens form salts when they are combined with ?
alkali metals
metal in group 1 of the periodic table is called?
alkali metals
the most reactive metals are?
alkali metals
Magnesium, calcium, and strontium are examples of ____________.
alkaline earth metals
alkali metals are ?
always combined with other elements
transition metals tent to ?
be shiny
Dmitri Mendeleev organized his periodic table by atomic weight, causing him to compromise on the placement of Tellerium in his periodic table. Henry Moseley built upon the work of others to refine the structure of the periodic table. . How is the modern periodic table organized as one goes across a row from left to right?
by increasing atomic number
In writing an element's symbol the first letter is always ________________ and the second letter is ____________________.
capitalized, not capitalized
These nuclei all have a different number of ?
capitalized, not capitalized
noble gasses are ?
colorless, and odorless
Which is a sub-atomic particle?
electron
In an electrically neutral atom of any element, there are equal numbers of ?
electrons and protons.
Hydrogen is an alkali metal
false
calcium is an alkali metal
false
elements in the oxygen group have eight valence electrons
false
many of the actinides do not occur in nature
false
noble gasses are found only in combination with other elements
false
selenium in an alkaline earth metal
false
the halogen group includes only gasses
false
there is just one group of transition metals
false
This section of the periodic table is called a(n) ?
group.
the most reactive nonmetals belong to the group called ?
halogens
elements in group 1 include ?
hydrogen and alkali metals
Luster Malleable Ductile Conductor Solid at room temperature . Which element could be described by the list of properties above?
magnesium
group 13-16 of the periodic table all contain one or more?
metalloids
The Groups 1 and 2 on the periodic table contain what atom type?
metals
Which is a gas at room temperature?
nitrogen
Helium, neon, and argon are examples of?
noble gases.
the least reactive elements are in the group called?
noble gasses
The atomic number of magnesium is 12. Its nucleus must contain ?
number of energy levels
alkali metals are?
soft
metal in group 3 of the periodic table are called?
transition metals
the lanthanides are metals known as ?
transition metals
Some alkali metals can float
true