Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.

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#Question id: 19509

#XL - P Chemistry

Which of the following elements has the maximum negative electron gain enthalpy?

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#Question id: 19510

#XL - P Chemistry

The most electronegative element in the periodic table is———

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#Question id: 19511

#XL - P Chemistry

The elements of group 16 are called———-

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#Question id: 19512

#XL - P Chemistry

In a group of the periodic table the Ionization enthalpies of the elements decreases from top to bottom because of ———-

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#Question id: 19513

#XL - P Chemistry

The smallest ion among the following is

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#Question id: 19514

#XL - P Chemistry

A cathode and an anode are the most common components of an electrochemical cell. Which of the following claims about the cathode is correct?