Advertisements
Advertisements
प्रश्न
The number of electrons in the atom of an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of an atom of this element ?
विकल्प
`""_15^31"X"`
`""_16^31"X"`
`""_15^16"X"`
`""_16^15"X"`
Advertisements
उत्तर
`""_15^31"X"`
In an atom, the number of electrons is equal to number of protons ,which in turn is equal to the atomic number of the element. Also, the sum of number of protons and neutrons represents the mass number of the element. Therefore, the correct option is (a).
APPEARS IN
संबंधित प्रश्न
Give the following a suitable word/phrase.
Atoms of same element with same atomic number but a different mass number.
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
The properties of the elements are a periodic function of their __________.
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical,
- what will be the ratio of their sizes?
- If atom is represented by planet earth ‘Re ’ = 6.4 ×106 m, estimate the size of the nucleus.
Compare the charge and mass of protons and electrons.
An element has 2 electrons in its N shell.
What is its atomic number?
