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The family/group where they belong.
The number and arrangement of electrons in atoms of an element determine the chemical properties of the element.
valence electrons
They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element. The electron arrangement is the same owing to same chemical properties. However they have different numbers of neutrons, which affects the mass number. Mass number determines the physical properties such as boiling/melting/density etc.
It's hard to answer this question, because it has a very large indirect effect, but very little direct effect. The number of protons in the nucleus determines what the element is, which in turn determines its chemical propertes. However, the nucleus does not itelf take part in chemical reactions.
It determines its chemical properties
valence
Chemical properties of an element determine by the number of electron
The main force that determines the chemical properties of an atom is nuclear force. There are other forces included like electrostatic force and force of attraction among others.
MEOW.
The number and arrangement of electrons.
The family/group where they belong.
All chemical properties are determined by electronic structure.
Electrons.
The number of electrons is very important.
It determines which element, which all have their own properties so yes. The mass number just determines the isotope which only affects their stability
There are specific factors that can contribute to a the properties of chemical elements. Some of these factors include the amount of valance electrons in the element.