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the reactivity of depends on the number of its outer shell electrons. one all outer shell electrons are there then there is little reactivity. If the atomic number is 19 then the element will 19 protons and 19 electrons. this means it has 2 electrons in the 1st shell 8 in the second 8 in the 3rd and 1 in the last. as it only has one it will be very reactive =)
What else can I help you with?
Which particle determines the atomic number of an element?
The atomic number of an element is determined by the number of protons.
Which mass number or atomic number determine what element an atom is?
The identity of the element is determined solely by the atomic number, which is the number of protons.
What is atomic number same as?
The atomic number is the same as the number of protons.
What element is the most reactive in the periodic table?
Fluorine is the most reactive non metal.Caesium is most reactive metal in the table.Fluorine has atomic number 9.
The atomic number of an element tells the?
atomic number tells us the number of protons and electrons in the given atom. As Atomic No. = no. of protons = No. of electrons
Which particle determines the atomic number of an element?
The atomic number of an element is determined by the number of protons.
Has a 19 atomic number?
Pottasium is a metal element. atomic number of it is 19.
Which mass number or atomic number determine what element an atom is?
The identity of the element is determined solely by the atomic number, which is the number of protons.
How can you determine the number of electrons in an element?
To determine the number of electrons in an element, you can look at the atomic number of the element on the periodic table. The atomic number represents the number of protons in the nucleus of an atom, which is equal to the number of electrons in a neutral atom.
If the atomic number of element D is 20 then what is the atomic number of element R?
34
How can one determine the number of electrons in an element?
To determine the number of electrons in an element, you can look at the element's atomic number on the periodic table. The atomic number represents the number of protons in the nucleus of an atom, which is equal to the number of electrons in a neutral atom.
What is atomic number same as?
The atomic number is the same as the number of protons.
How do you determine neutrons in element?
subtract the atomic number from the mass number
What are the most reactive elements?
That would be the element with the highest atomic number but the lowest number of valence electrons.
Is the element determine by the number of protons?
The atomic number is equal to the number of protons.
What element is the most reactive in the periodic table?
Fluorine is the most reactive non metal.Caesium is most reactive metal in the table.Fluorine has atomic number 9.
Can you determine the element with only knowing the number of protons?
The number of protons is the "atomic number", so you look that up in the periodic table.
