science
Grade-9
Easy
Question
If an element has 18 electrons and has a valency of 1, then what is that element?
- Argon
- Potassium
- Chlorine
- Fluorine
Hint:
The element that has 18 electrons and 1 valency is chlorine.
The correct answer is: Chlorine
- The chlorine has the atomic number 17.
- It has 2 electrons in the first shell, 8 electrons in the second shell, and 7 electrons in the outermost shell.
- It has a valency of 1.
- The Cl- gains an electron and the configuration becomes 2,8,8. So there will be 18 electrons.
Related Questions to study
science
An atom with 9 protons and 10 neutrons, will have the valence electrons of
An atom with 9 protons and 10 neutrons, will have the valence electrons of
scienceGrade-9
science
The first atomic model of the atom was discovered by
The first atomic model of the atom was discovered by
scienceGrade-9
science
How many neutrons are there in copper?
How many neutrons are there in copper?
scienceGrade-9
science
Which of the following is correct to find the number of neutrons?
Which of the following is correct to find the number of neutrons?
scienceGrade-9
science
If an element has 13 protons and 14 neutrons, which of the following will be the correct representation of an element?
If an element has 13 protons and 14 neutrons, which of the following will be the correct representation of an element?
scienceGrade-9
science
Why does an element have to lose or gain electrons?
Why does an element have to lose or gain electrons?
scienceGrade-9
science
Which of the following is not a pair of isotopes?
Which of the following is not a pair of isotopes?
scienceGrade-9
science
Which of the following is incorrect according to the isotope?
Which of the following is incorrect according to the isotope?
scienceGrade-9
science
Element with same atomic number but a different mass number
Element with same atomic number but a different mass number
scienceGrade-9
science
What is the location of a proton in an atom?
What is the location of a proton in an atom?
scienceGrade-9
science
Mass number of an element is represented with
Mass number of an element is represented with
scienceGrade-9
science
Mass of protons and neutron is _________ times more than the electrons
Mass of protons and neutron is _________ times more than the electrons
scienceGrade-9
science
The number of electrons present outside the nucleus that revolves around it is called
The number of electrons present outside the nucleus that revolves around it is called
scienceGrade-9
science
The number of protons and neutrons combining in an atom is called
The number of protons and neutrons combining in an atom is called
scienceGrade-9
science
Which of the following isotopes is used for the treatment of cancer?
Which of the following isotopes is used for the treatment of cancer?
scienceGrade-9
