0
What are the atomic numbers of the first three elements in Group 1?
Wiki User
∙ 14y ago
- 1 H Hydrogen
- 3 Li Lithium
- 11 Na Sodium
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What are the is the atomic numbers of la and ac on the periodic table?
La has atomic number 57.Ac has atomic number 89.They both are first elements of lanthanoids and actinoids group respectively.
Are elements organized by atomic weight and physical properties?
Elements are scientificaly organised according to their Proton numbers. Those with smaller proton numbers come first.
Elements with atomic numbers of 58 through 71 are known as the?
The elements beginning with Lanthanum (atomic number 57) and ending with Lutetium (atomic number 71) are called Lanthanides. They are also known as rare earth elements.
What was the periodic table first arranged by. How has this changed?
In 1869 Russian teacher and scientist Dmitri Mendeleev, presented a periodic table of the elements based on atomic weights. The current periodic table is arranged by the atomic numbers of the elements.
What is the periodic law?
Periodic Table of elements.
What are the is the atomic numbers of la and ac on the periodic table?
La has atomic number 57.Ac has atomic number 89.They both are first elements of lanthanoids and actinoids group respectively.
Are elements organized by atomic weight and physical properties?
Elements are scientificaly organised according to their Proton numbers. Those with smaller proton numbers come first.
Did Dmitri Mendeleev organize elements by atomic numbers or atomic mass?
At first, he did it by atomic mass, but that didn't quite work out right, so he changed it to atomic number.
Elements with atomic numbers of 58 through 71 are known as the?
The elements beginning with Lanthanum (atomic number 57) and ending with Lutetium (atomic number 71) are called Lanthanides. They are also known as rare earth elements.
What was the periodic table first arranged by. How has this changed?
In 1869 Russian teacher and scientist Dmitri Mendeleev, presented a periodic table of the elements based on atomic weights. The current periodic table is arranged by the atomic numbers of the elements.
What is the periodic law?
Periodic Table of elements.
What are the characteristic of the elements was used in early attempts to classify the elements according to their chemical similarities?
The elements were first arranged by the atomic mass of the elements in the first original table. Then it was arranged by atomic number.
What is method of calculating a valency of an element?
The valency of first four main group elements is equal to their group numbers but elements from Group 5 to 8 have two valencies one equal to group number and second is obtained by subtracting group number from 8.
What is the first actinide element?
ActinidesThis is a group of elements within the periodic table and are also known as the transuranics. The name refers to those elements with increasing atomic no. from actinium, which all have similar chemical properties, like the lanthanides. The first few members of the group are the naturally occurring elements actinium, thorium, proactinium and uranium. Beyond this elements have been made artificially by radioactive bombardment. These artificial elements are unstable, some have very short lifeimes and undergo spontaneous radioactive decay.
What is liquid out of the first twenty elements?
at 250C and 101 kPa there are no elements that are liquid in the first twenty elements. the only elements on the periodic table that are liquid are bromine (atomic number: 35) and Mercury (atomic number: 80).
Who was the first to notice that properties of elements exist as a perdoic function of atomic mass?
Mendeleev was the first to notice that properties of elements exist as a perdoic function of atomic mass
Elements in the first group?
elements of girst group are called alkali metals
