Gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
The original material has decayed 75%
<h3>Further explanation</h3>
Given
two half-life
Required
The decayed sample
Solution
General formulas used in decay:

t = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
t = 2 x t 1/2
Input the value :
The amount of Nt = 25% No
Metallic bonds
Explanation:
The physical properties of metals such as malleability, ductility, electrical and thermal conductivity, luster e.t.c is controlled by metallic bonds.
- Metallic bonds join atoms of metals and alloys together.
- The formation of this bond type is favored by large atomic radius, low ionization energy and a large number of electrons in the valence shell.
- Metallic bond is actually an attraction between the positive nuclei of all closely packed atoms in the lattice and the electron cloud jointly formed by all atoms losing their outermost shell electrons.
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Bonds brainly.com/question/6071838
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