The lightest chemical element is Hydrogen and the heaviest is
Hassium
Which element has the greatest atomic mass Brainly?
Oxygen
has the highest atomic mass: 16 amu.
Which element has an average atomic mass?
When data are available regarding the natural abundance of various isotopes of an element, it is simple to calculate the average atomic mass. For
helium
, there is approximately one isotope of Helium-3 for every million isotopes of Helium-4; therefore, the average atomic mass is very close to 4 amu (4.002602 amu).
Which elements atoms have the greatest average number of?
Answer: Number of neutrons of the elements can be calculated if the atomic number and mass number is known. in
Tellurium
, therefore Tellurium have the greatest average number of neutrons.
Which element has the smallest atomic radius?
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus,
helium
is the smallest element, and francium is the largest.
Which best describes ionization energy?
Ionization energy refers to
the amount of energy needed to remove an electron from an atom
. Ionization energy decreases as we go down a group. Ionization energy increases from left to right across the periodic table.
What do you call the element from atomic number 57 71?
The elements from atomic number 57 to 71 are called
Lanthanides
. They are called lanthanides, since lanthanum is chemically identical to the elements in the sequence. … The lanthanides are between Barium and Hafnium.
How do we calculate atomic mass?
For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu).
By adding together the number of protons and neutrons and multiplying by 1 amu
, you can calculate the mass of the atom.
Why does tellurium come before iodine?
Iodine has a lower relative atomic mass than tellurium
. So iodine should be placed before tellurium in Mendeleev's tables. To make iodine line up with chlorine and bromine in his table, Mendeleev swapped the positions of iodine and tellurium. …
What is the most likely reason Mendeleev?
What is the most likely reason that Mendeleev placed tellurium before iodine? Mendeleev observed that
tellurium has chemical properties like other elements in its group
, and he did not know that neutrons cause the greater atomic mass. You just studied 18 terms!
What are the elements in Group 2 called?
Group 2A (or IIA) of the periodic table are the
alkaline earth metals
: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
What element in the second period has the largest atomic radius?
Answer: In the second period of modern periodic table
Lithium (Li)
is the element with largest atomic radius.
How do you find atomic radius?
Atomic Radius
The radius of an atom can only be found by
measuring the distance between the nuclei of two touching atoms, and then halving that distance
. As you can see from the diagrams, the same atom could be found to have a different radius depending on what was around it.
Which atom has the largest ionization energy?
The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus,
helium
has the largest first ionization energy, while francium has one of the lowest.
How do you explain ionization energy?
The ionization energy is
a measure of the capability of an element to enter into chemical reactions requiring ion formation or donation of electrons
. It is also generally related to the nature of the chemical bonding in the compounds formed by the elements.
