The Periodic Table
1. This question has 4 part(s).
1.1. Mendeleev's Periodic Table was published in 1869, classifying the elements that had been discovered at that time by their atomic weights. Part of his Periodic Table is shown.
Use the information in this table and the Periodic Table to answer the questions.
Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | Group 6 | Group 7 |
H | ||||||
Li | Be | B | C | N | O | F |
Na | Mg | Al | Si | P | S | Cl |
Hydrogen is an element from Mendeleev's table that is not in the same group of the modern Periodic Table.
Give two reasons why it should not be in Group 1.
1.2. Give two reasons why hydrogen could be placed in Group 1.
1.3. Give two reasons why hydrogen could be placed in Group 7.
1.4. The modern Periodic Table arranges the elements in order of atomic number.
What scientific discoveries allowed elements to be placed in their correct period and group?
How did this knowledge allow elements to be correctly placed?
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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