Answer:
LITHIUM-ION.
Explanation:
ATOMIC STRUCTURE -
The smallest unit has the characteristics property of an element.
An atom consists of electron revolving around the nucleus in fixed orbits.
The Nucleus is a centrally located mass formed by the protons and the neutrons.
The atomic mass of an element is given as the sum of the protons and neutrons.
The Atomic number is equal to the number of protons or electrons.
In the given element element,
Atomic mass = 3 + 4 = 7
Atomic number = 3
As the number of protons in the atom is greater than the number of electrons by 1. Therefore, the element is a cation.
The element with atomic number 3 and atomic mas 7 is LITHIUM-ION.
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