The elemental weapon spell was a 3rd level spell which gives your weapon +1 to hit and also +1d4 elemental damage, plus additional +1/+1d4 per an additional 2SL . Otherwise the spells are mostly identical. This is available in 237th page of players handbook.
Overview Of Elemental Weapon 5e Spell
Actually, one of the non magical weapons which you’ve touched would become a magic weapon 5e. As per this dnd 5e Elemental Weapon Spell you have to chose one of the following damage types such as: acid, cold, fire, lightning, or else the thunder.
Normally, for the specific duration, the 5e weapon has +1 bonus to attack rolls and also deals an extra 1d4 damage of a chosen type whenever it hits.
At Higher Levels:
You can cast this Elemental Weapon 5e Spell but whenever you cast this dnd 5e spell by using the spell slot of 5th or 6th level and also the bonus to attack rolls increases to +2 and also the additional damage would increase to 2d4.
So whenever you use a spell slot of 7th level or more than the 7th level, the bonus do increase to +3 and of course the extra damage would increase to 3d4.
D&D 5E Elemental Weapon Spell Attributes
|Casting Time||1 Action|
|Duration||Concentration, up to 1 hour|