Guess the Word

This word has 10 letters namely

1234567890

1234 - carries heredity
456 - is a period of time
567 - is a pest
and 890 - is a charged particle
What is the word?



Answer
GENERATION
1234 carries heredity - gene
456 - is a period of time - era
567- is a pest - rat
890 is a charged particle - ion