Advertisements
Advertisements
प्रश्न
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
उत्तर
Y
APPEARS IN
संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
Write the names of the elements present in the following compound.
Common salt
Write the names of `"Na"_3"PO"_4` compounds :
Name three non-metals/radicals which have valency -1, -2, and -3.
State Dalton’s atomic theory.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
State two observations which show that atom is not indivisible.
Find the mass of 2 moles of nitrogen atoms.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Deduce from the datum provided.
Datum | To deduce |
\[\ce{_11^23Na}\] | Neutron number |
\[\ce{_6^14C}\] | Mass number |
\[\ce{_17^37 Cl}\] | Proton number |
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
Which of the following statements made by Dalton has not undergone any change?
In all atoms of an element
In the nucleus of `""_20"Ca"^40`, there are ______
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
1 mole of Gold and Silver contain same number of atoms.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
What is the fundamental particle of an element?
What are the 3 most abundant atoms on the earth?